Qianqian Ma

Qianqian Ma
South China Botanical Garden

PhD

About

35
Publications
6,194
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
423
Citations

Publications

Publications (35)
Article
The role of indirect relations within an ecosystem is crucial to its function. Emergent properties such as adaptability, plasticity, and robustness are hard to explain without understanding the system-wide effects of direct and indirect interactions. In this paper, we take advantage of a different representation of ecosystem models to provide a bet...
Article
The occurrence of species-specific phenological timing among populations over broad geographical areas may have converged or diverged with recent climatic warming. The changes in spatial geographical variability of phenological timing may affect the degree of species overlap, and thus have profound ecological consequences in the context of global c...
Article
Frost events during the active growth period of plants can cause extensive frost damage with tremendous economic losses and dramatic ecological consequences. A common assumption is that climate warming may bring along a reduction in the frequency and severity of frost damage to vegetation. On the other hand, it has been argued that rising temperatu...
Article
Full-text available
Wood formation consumes around 15% of the anthropogenic CO 2 emissions per year and plays a critical role in long-term sequestration of carbon on Earth. However, the exogenous factors driving wood formation onset and the underlying cellular mechanisms are still poorly understood and quantified, and this hampers an effective assessment of terrestria...
Article
1. Leaf-out and flowering are two key phenological events of plants, denoting the respective onsets of visible vegetative growth and reproduction during the year. For each species, the schedule of vegetative growth and reproduction is crucial to the maximization of its fitness. Warming-induced advances of leaf-out and flowering have been reported f...
Article
摘要: 土壤微生物对无机氮的固持作用是构成土壤保氮机制的重要组成。作为土壤微生物的两大主要类群,真菌和细菌是微生物固持无机氮作用的主要参与者。然而,由于土壤微生物的高度复杂多变性,如何有效区分和量化土壤中真菌和细菌各自对无机氮的固持作用是个难题。针对该问题,本文采用“氨基糖稳定同位素探针(AS-SIP)”技术来区分和表征土壤中真菌、细菌各自对无机氮的固持速率。基于此进一步揭示了农业利用和外源碳输入分别对土壤真菌、细菌各自固持硝态氮作用的影响及原因,构建了土壤中真菌、细菌各自固持无机氮实际速率的估算模型,为区分和量化土壤中真菌、细菌各自对无机氮的实际固持速率提供了更为可信的新方法。本文介绍了AS-SIP 技术原理、主要技术优势、应用案例、不足之处以及改进对策,以期推进该方法的应用和发展。 A...
Article
Full-text available
Denitrification is a microbially facilitated process where nitrate (NO3-) is reduced and ultimately produces dinitrogen(N2) through a series of intermediate nitrogen oxide products, i.e., nitrite, nitric oxide, nitrous oxide. Denitrification has long been considered as one of the major pathways of nitrogen (N) loss when N fertilizer is applied to f...
Article
Full-text available
农业生态系统氮循环直接关系到粮食安全和生态环境保护, 受到国内外的广泛关注。生态系统氮循环包括氮在生态系统各个组分间迁移和转化的全部过程, 具有整体性和复杂性。然而, 现有研究大多集中在氮循环的单一或局部过程, 难以从全局水平上反映农业生态系统氮循环的变化规律。作为一种系统分析工具, 生态网络分析通过构建可以模拟复杂系统中物质或者能量流动结构的生态网络分室模型, 进而可以从全局的视角来分析生态系统的内在、整体属性及其变化规律。因此, 利用生态网络分析从整体上审视农业生态系统氮素循环规律具有良好的应用及发展前景。鉴于此, 该文介绍了生态网络分析方法的基本原理、作者在生态网络分析方法研究中取得的新进展, 包括基于自主提出的网络粒子追踪法(Network Particle Tracking, 简称...
Article
Atmospheric nitrogen (N) deposition and increasing precipitation affect carbon sequestration in terrestrial ecosystems, but how these two concurrent global change variables affect xylem growth in trees (i.e., independently or interactively) remains unclear. We conducted novel experiments in central China to monitor the xylem growth in a dominant sp...
Article
Microbial inorganic nitrogen (N) immobilization is an important mechanism in the retention of N in soils. However, as a result of the high diversity and complexity of soil microorganisms, there is still no effective approach to measuring the respective immobilization rates of inorganic N by fungi and bacteria, which are the two dominant microbial c...
Article
In their Letter, Elmendorf and Ettinger (1) question the dominant role of photoperiod in driving secondary growth resumption (hereafter referred to as xylem formation onset) of the Northern Hemisphere conifers, recently reported by Huang et al. (2). Their opinions are grounded on the following three aspects, including 1) the seasonality of the phot...
Article
Plant residue incorporation improves soil microbial nitrate immobilization, which in turn alleviates nitrate accumulation, thereby improving N retention capacity and reducing N losses. However, how and why the respective nitrate immobilization by fungi and bacteria, which are dominant microorganisms in soil, responds to residue addition remains unk...
Article
Full-text available
Key message Nitrogen addition during 4 years to the canopy of Castanopsis chinensis (Sprengel) Hance promoted xylem formation, mainly by increasing radial growth during the early growth season. ContextIncreased atmospheric nitrogen (N) deposition caused by intensive anthropogenic activities resulted in inconsistent effects on the xylem formation of...
Preprint
Full-text available
Microbial inorganic nitrogen (N) immobilization constitutes an important mechanism for soil N retention. However, the immobilization rates of inorganic N by fungi and bacteria, the dominant microorganisms in soil, are still unavailable due to the high diversity and complexity of soil microorganisms. Here we propose a mathematical framework, based o...
Article
Gaseous nitrogen (N) emissions, especially emissions of dinitrogen (N2) and ammonia (NH3), have long been considered as the major pathways of N loss from flooded rice paddies. However, no studies have simultaneously evaluated the overall response of gaseous N losses to improved N fertilization practices due to the difficulties to directly measure N...
Article
It is critical to investigate the effects of competition and climate on forest growth as they are main forces affecting forest dynamics. However, in subtropics of China such a study has never been conducted. Here we conducted a pioneer study to evaluate the effects of competition and climate on growth of Chinese red pine (Pinus massoniana) in mixed...
Article
Understanding the effect of increasing atmospheric nitrogen (N) deposition on xylem growth of trees is critical to predict tree growth and carbon sequestration under global change. Canopy N addition (CAN) is generally believed to realistically simulate atmospheric N deposition on terrestrial ecosystems given it takes all processes of N deposition f...
Article
Contrary to the generally advanced spring leaf unfolding under global warming, the effects of the climate warming on autumn leaf senescence are highly variable with advanced, delayed, and unchanged patterns being all reported. Using one million records of leaf phenology from four dominant temperate species in Europe, we investigated the temperature...
Article
Under current global warming, high‐elevation regions are expected to experience faster warming than low‐elevation regions. However, due to the lack of studies based on long‐term large‐scale data, the relationship between tree spring phenology and the elevation‐dependent warming is unclear. Using 652k records of leaf unfolding of five temperate tree...
Article
Tree growth is affected by many exogenous and endogenous factors, especially climate and competition. To address the issue of how these factors influence tree growth under global warming, dendroclimatology combined with competition analysis was used to examine the radial growth response of two major species – Pinus massoniana and Schima superba in...
Article
Full-text available
In recent decades, anthropogenic activities have increased nitrogen (N) deposition in terrestrial ecosystems. This higher availability of N is expected to impact plant growth. However, the effects of N deposition on tree growth remain inconclusive due to the wide variability of experimental methods used. This study aimed to test the effect of short...
Chapter
We describe 40 system-wide ecosystem measures, developed to capture essential information about ecosystem structure and function. Comprehending this many measures is an extremely challenging task, and limits their effective utilization. We use 52 real-life ecosystem models selected from the literature to investigate the relationships among these me...
Presentation
Comparing indirect and direct effects within ecological networks: a stochastic approach
Conference Paper
Full-text available
Network Particle tracking (NPT), followed by a post path analysis can provide an analysis for a non-conservative information flows based on preliminary results. In theory, one can model a curriculum with data on documentation and retention of instruction at the course. An analogue of thermodynamic temperature appears to measure the importance of th...
Presentation
A revised formula for the calculation of indirect effects in ecological networks
Presentation
Analysis of indirect effects within ecosystem models using pathway-based methodology
Chapter
Full-text available
Various measures have been defined to capture universal system-wide properties of ecological networks, such as cycling index, throughflow analysis, and storage analysis. Current methodologies are mainly applicable to steady-state networks, greatly limiting their application. Effects of environmental impacts, seasonal variations, and climate shifts...
Article
This paper analyses the transient dynamics, steady states, and a set of diagnostic system-wide properties of a linear flow-quantified pastoral food web from the Chernivtsi Region of Ukraine. The web in question is one of 31 so-described; it contains 86 nodes and 496 links. On-line simulation and network analysis software EcoNet was used to quantify...
Article
Ecological network analysis measures such as cycling index, indirect effects, and storage analysis provide insightful information on ecosystem organization and function, which can be extremely useful for environmental management and control. These system-wide measures focus on indirect relations among system compartments, providing a holistic appro...
Presentation
A stochastic measure for dynamic storage analysis
Presentation
Dynamic storage analysis and residence time distribution for ecological networks
Presentation
An agent-based methodology to study residence time for compartmental systems
Poster
Use of simulation-based methodology to study residence time and its distribution for compartmental systems