Guangdi Li

Guangdi Li
NSW Department of Primary Industries, Wagga Wagga, Australia

PhD

About

211
Publications
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Publications

Publications (211)
Article
Full-text available
Purpose A poor understanding of the nature of variation of soil properties within a field can lead to management decisions that reduce productivity or increase off-site environmental risks. Methods The variability in total C%, total N%, plant-available (Colwell) P, and pH in CaCl2 at multiple depths is examined from two sites near Wagga Wagga and...
Article
Full-text available
PurposeExcess anion uptake in the form of nitrate has been shown to reduce soil acidification. The question is to what extent the deep placement of calcium nitrate can increase this root-induced alkalization in reducing subsurface soil acidity.Methods Wheat and canola were grown for 35 days in reconstructed soil columns comprising of topsoil (pHCaC...
Article
Full-text available
PurposeBiochars have potential to reduce soil acidity and Al3+ toxicity, and increase the availability of soil nutrients. This study aimed to compare the effectiveness of biochars and their raw feedstocks in amelioration of soil acidity.Materials and methodsTen ameliorants comprising of five biochars (pyrolyzed at 550°C) and their corresponding fee...
Article
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AimsThe utilisation of on-farm crop residues to ameliorate soil acidity is thought to be more cost-effective than other organic materials such as animal manures. In addition, using NO3− as the form of N can induce rhizosphere alkalinisation due to the excess uptake of anions over cations by plant roots.MethodsA pot experiment was conducted to evalu...
Article
Combatting subsoil acidity is a challenge as the incorporation of lime in subsurface layers may not be economically feasible. The use of nitrate to facilitate plant excess anion uptake has been shown potential to increase soil pH. A column experiment was carried out to demonstrate this root-induced alkalization in various depths in an acid soil wit...
Article
Full-text available
PurposeSubsurface soil acidity in conjunction with aluminium (Al3+) toxicity is a major limitation to agricultural production globally. The conventional use of surface-applied lime is often insufficient at correcting subsurface acidity; therefore, new practices and ameliorants are required.Methods This 3-month leaching experiment investigated wheth...
Article
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PurposeSoil acidity with high Al3+ and Mn2+ is one of the major constraints to global food production. Lime is effective to increase soil pH, but it is not always readily available and can be expensive. This study aimed to evaluate the effectiveness of organic amendments that may be viable for treating soil acidity.Materials and methodsThirteen org...
Article
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AimsTo examine the legacy of pasture drill rows sown to various configurations of subterranean clover (Trifolium subterraneum L.), lucerne (Medicago sativa L.) and phalaris (Phalaris aquatica L.), on soil chemical characteristics and wheat (Triticum aestivum L.) production in the year following pasture removal.MethodsA field experiment comparing 10...
Article
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Changed spatial configurations at sowing have been investigated as a strategy to minimize interspecific competition and improve the establishment and persistence of multi-species plantings in pastures, but the impact of this practice on the soil microbiome has received almost no previous research attention. Differences in populations of bacteria an...
Article
Subsurface soil acidity is a serious constraint to crop production and is inherently difficult to correct through conventional application of lime. Thus, new approaches to ameliorate subsurface soil acidity are needed. A column leaching experiment was established to determine whether the plant residues, when combined with lime, could facilitate lim...
Article
Soil pH is seldom uniform with depth, rather it is stratified in layers. The soil surface (0–0.02 m) commonly exhibits relatively high pH and overlies a layer of acidic soil of 0.05–0.15 m deep, termed an acidic subsurface layer. Commercial and research sampling methods that rely on depth increments of 0.1 m either fail to detect or under report th...
Conference Paper
Excess anion uptake in the form of nitrate has been shown to reduce soil acidification at depth. This root-induced alkalization of rhizosphere soil can be extended to bulk soil. This study investigated ways to maximize the alkalinizing effect of calcium nitrate in reducing subsoil acidity in wheat (ET8) and canola (44Y90). A controlled environment...
Article
An 18-year field experiment was conducted on a highly acidic soil in the mixed farming zone of south-eastern Australia. The experiment was a fully phased design with three major treatment contrasts: perennial systems versus annual systems; unlimed versus limed treatments; and permanent pasture versus pasture-crop rotations. The hypotheses tested in...
Article
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This review examines the prospect of improving perennial legume adaptation to grazed mixed pasture swards across the higher-altitude regions of south-eastern Australia through improved management, particularly as it relates to soil fertility. The range of adapted perennial species available to farmers often remains limited to only one perennial for...
Article
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A network of 21 experiments was established across nine countries on four continents and spanning both hemispheres, to evaluate the relative performance of early generation perennial cereal material derived from wheat, rye, and barley and to inform future breeding strategies. The experimental lines were grown in replicated single rows, and first ye...
Article
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Perennial grass-based pastures are uncommon in phased cropping rotations in south-eastern Australia, where rainfall often limits production and persistence. The high reliance on pure legume-based pastures limits overall pasture productivity and has adverse effects on environmental parameters such as weed incursion and ground cover. A field experime...
Article
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Nitrification and urease inhibitors have been used to reduce nitrous oxide (N2 O) emissions and increase nitrogen use efficiency in many agricultural systems. However, their agronomic benefits, such as the improvement of grain yield, is uncertain. A two-year field experiment was conducted to (1) investigate whether the use of 3,4-dimethylpyrazole p...
Article
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Estimating the likely variance in soil organic carbon (OC) at the scale of farm fields or smaller monitoring areas is necessary for developing sampling protocols that allow temporal change to be detected. Given the relatively low anticipated soil OC sequestration rates (<0.5 Mg/ha.0.30 m/year) for dryland agriculture it is important that sampling s...
Article
Carbon (C) and nitrogen (N) allocation and assimilation are coupled processes, likely influencing C accumulation, N use efficiency and plant productivity in agro-ecosystems. However, dynamics and responses of these processes to management practices in semi-arid agro-ecosystems are poorly understood. A field-based ¹³CO2 and urea-¹⁵N pulse labelling...
Article
This study examined the response of forage crops to composted dairy waste (compost) applied at low rates and investigated effects on soil health. The evenness of spreading compost by commercial machinery was also assessed. An experiment was established on a commercial dairy farm with target rates of compost up to 5 t ha ⁻¹ applied to a field contai...
Article
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This study examined whether the productivity and persistence of mixed pastures that included subterranean clover (Trifolium subterraneum L.), lucerne (Medicago sativa L.), and/or phalaris (Phalaris aquatica L.) were improved if species were spatially separated rather than being sown together in each drill row. The study also compared the productivi...
Article
Nitrogen (N) contributed by legumes is an important component of N supply to subsequent cereal crops, yet few Australian grain-growers routinely monitor soil mineral N before applying N fertiliser. Soil and crop N data from 16 dryland experiments conducted in eastern Australia from 1989-2016 were examined to explore the possibility of developing si...
Article
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Rainfed farms in south-eastern Australia often combine annual cropping and perennial pasture phases with grazing sheep enterprises. Such diversity serves in managing diseases, pests and plant nutrition while stabilising income in the face of wide, uncorrelated variations in international commodity prices and local weather over time. We use an actua...
Article
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Cover crop species are usually grown to control weeds. After cover crop harvest, crop residue is applied on the ground to improve soil fertility and crop productivity. Little information is available about quantifying the contributions of cover crop application to soil total carbon (C) and nitrogen (N) contents in temperate Australia. Here, we sele...
Article
New breeding lines of phalaris (Phalaris aquatica), cocksfoot (Dactylis glomerata) and tall fescue (Festuca arundinacea = syn. Lolium arundinaceum) are currently under evaluation for the selection of new cultivars for low rainfall environments. The aim was to test the relative tolerance of 6 elite genotypes of phalaris, cocksfoot and tall fescue to...
Article
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Aims We hypothesised that a) species with greater acid soil tolerance have an increased capacity to utilise incipient rainfall; and b) liming increases the productivity and the ability of pasture species to utilise available water resources in the profile of an acid soil. Methods A field experiment was established on a moderately acidic yellow Kand...
Article
Dryland cereal production systems of south-eastern Australia require viable options for reducing nitrous oxide (N2O) emissions without compromising productivity and profitability. A 4-year rotational experiment with wheat (Triticum aestivum L.)-canola (Brassica napus L.)-grain legumes-wheat in sequence was established at Wagga Wagga, NSW, Australia...
Article
Nitrous oxide (N2O) emissions from Australian grain cropping systems are highly variable due to the large variations in soil and climate conditions and management practices under which crops are grown. Agricultural soils contribute 55% of national N2O emissions, and therefore mitigation of these emissions is important. In the present study, we expl...
Article
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Newly developed candidate cultivars of cocksfoot (Dactylis glomerata L.), phalaris (Phalaris aquatica L.) and tall fescue (Festuca arundinacea Schreb. = syn. L. arundinaceum (Schreb) Darbysh.) were evaluated over four years for persistence and productivity against current commercial cultivars in small plots at five locations selected for lower and...
Conference Paper
Full-text available
Cultivars of phalaris (Phalaris aquatica L.) and cocksfoot (Dactylis glomerata L.) suited to lower rainfall cropping environments have existed in Australia for over 40 years, but remain rarely used in commercial crop rotations. A field experiment was established in 2010 at Ariah Park, NSW, to test the persistence of phalaris cv. Sirolan and cocksfo...
Conference Paper
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Phalaris (Phalaris aquatica L.) has been cultivated in Australia as a forage grass for over a century. Since the 1970’s it has developed a reputation for being sensitive to soil acidity with conventional wisdom typically advising against its use on acid soils. However, several recent studies have called this view into question and have prompted a r...
Conference Paper
Full-text available
Establishing and maintaining a balanced mixture of perennial and annual pasture species is often difficult, especially in drier environments. One method to reduce the competition between pasture species and to improve the potential productivity and nitrogen fixed by the pasture is to establish pasture species in separate rows (alternate row sowings...
Article
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This study determined the long-term effect of tillage systems on soil properties and crop yields in a semiarid environment. Field pea (Pisum sativum L.) and spring wheat (Triticum aestivum L.) were alternately grown in six tillage systems at Dingxi (35°28'N, 104°44'E), northwest China starting in 2001. After the first 6 years of experiments, conven...
Article
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The sensitivity of surface air temperature response to different grassland types and vegetation cover changes in the regions of temperate grassland of China was analyzed by observation minus reanalysis (OMR) method. The basis of the OMR approach is that reanalysis data are insensitive to local surface properties, so the temperature differences betw...
Article
The abundance and distribution of species can be ascribed to both environmental heterogeneity and stress tolerance, with the latter measure sometimes associated with phenotypic plasticity. Although phenotypic plasticity varies predictably in response to common forms of stress, we lack a mechanistic understanding of the response of species to high s...
Article
Perennial grasses provide forage and environmental benefits in the agricultural systems of southern Australia, but persistent cultivars are lacking for the lower rainfall inland margins (<600 mm average annual rainfall). Potential new cultivars of cocksfoot (Dactylis glomerata L.), tall fescue (Festuca arundinacea Schreb. = syn. Lolium arundinaceum...
Article
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Aims In this study, we aimed to understand effects and mechanisms of legume species and their relative abundance on soil N, species recruitment, and productivity in mixed grassland. We also assessed the utilization prospect of several legumes in natural grassland. Methods In 2006, grass-legume combinations (GLCs) with different ratios (GLR) were es...
Article
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Based on GIMMS NDVI and climate data from 1982 to 2006, this study analyzed the impact of climate change on grassland in China. During the growing season, there were significant effects of precipitation on the growth of all the grassland types (), except for meadow vegetation. For the air temperatures, there existed asymmetrical effects of maximum...
Conference Paper
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We consider the limitations of optimisation analyses that ignore farm-level financial risks arising from combinations of high fixed costs, including debt burdens and highly variable local weather and prices. A sequential multivariate analysis method is used to compute cumulative distribution functions of decadal whole-farm cash balances for a farm...
Article
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We examined the spatiotemporal variation in diurnal temperature range (DTR) and discussed the reasons for the changes of DTR in China based on data from 479 weather stations from 1962 to 2011. Results showed that DTR decreased rapidly (0.291 C/decade) from1962 to 1989 due to slightly decreased Tmax and significantly increased Tmin, but the decrease...
Article
Full-text available
We examined the spatiotemporal variation in diurnal temperature range (DTR) and discussed the reasons for the changes of DTR in China based on data from 479 weather stations from 1962 to 2011. Results showed that DTR decreased rapidly (0.291 C/decade) from1962 to 1989 due to slightly decreased Tmax and significantly increased Tmin, but the decrease...
Article
Prediction and making targeted measures to address global climate change requires precise estimate of local, regional, and global carbon budgets. Previously estimated global carbon budgets had significant uncertainty partly due to overlooking the soil carbon loss from soil erosion. However, as result of surface features being indistinguishable betw...
Article
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The accurate estimation of soil C stock is important for understanding the global C cycles. Particularly in arid regions, quantification of soil inorganic carbon (SIC) is required in addition to the more frequently reported soil organic carbon (SOC). We analyzed SOC, SIC, soil bulk density (BD), electrical conductivity (EC) and pH of alkali-saline...
Article
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Research efforts around the world have been increasingly devoted to investigating changes in C3 and C4 species' abundance or distribution with global warming, as they provide important insight into carbon fluxes and linked biogeochemical cycles. However, changes in the early life stage (e.g. germination) of C3 and C4 species in response to global w...
Article
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In order to restore a degraded alkaline grassland, the local government implemented a large restoration project using fences in Changling county, Jilin province, China, in 2000. Grazing was excluded from the protected area, whereas the grazed area was continuously grazed at 8.5 dry sheep equivalent (DSE)/hm2. In the current research, soil and plant...
Article
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In the current study, a field experiment was conducted to examine effects of litter on seedling emergence and early growth of four dominant weed species from the early successional stages of old field ecosystem and two perennial grassland species in late successional stages. Our results showed that increased litter cover decreased soil temperature...
Technical Report
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Australian farmers face between three and ten times the level of production risk faced by farmers in competing countries worldwide (OECD-FAO, 2011), Consequently, in Australia, identical management plans may result in sharply contrasting distributions of financial outcomes. These differences provide more complete management information than those b...
Article
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A series of seed priming experiments were conducted to test the effects of different pretreatment methods to seed germination, seedling growth, and seed yield traits in maize (Zea mays L.). Results indicated that the seeds primed by gibberellins (GA), NaCl, and polyethylene glycol (PEG) reagents showed a higher imbibitions rate compared to those pr...
Article
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Functional diversity, which is the value, variation and distribution of traits in a community assembly, is an important component of biodiversity. Functional diversity is generally viewed as a key to understand ecosystem and community functioning. There are three components of functional diversity, i.e. functional richness, evenness and divergence....