Luwen Wan

Stanford University | SU · Earth System Science

Agricultural water management is increasingly prioritized throughout the world as producers are tasked with meeting growing crop demand while also managing environmental resources more sustainably. Likewise, agriculture is increasingly modifying the terrestrial water cycle. In response to these dynamics, the informal research discipline of agrohydr...

Nitrogen and phosphorus pollution is of great concern to aquatic life and human well-being. While most of these nutrients are applied to the landscape, little is known about the complex interplay among nutrient applications, transport attenuation processes, and coastal loads. Here, we enhance and apply the Spatially Explicit Nutrient Source Estimat...

Water data are essential for monitoring, managing, modelling and projecting water resources. Yet despite such data—including water quantity, quality, demand and ecology—being extensively collected in China, it remains difficult to access, use and share them. These challenges have led to poor data quality, duplication of effort and wasting of resour...

As total nitrogen (TN) and total phosphorus (TP) pollution is the main source of water pollution in the Huaihe River watershed in China, it is important to understand how TN and TP pollution affect the relationship between water supply and demand. Quantifying their impacts and describing the spatiotemporal distribution of this relationships are nec...

This study took the Meijiang River Basin, China, as an example, to simulate the resilience interactions of three key subsystems of land, water and biodiversity from 2000 to 2015, using a spatially explicit model. Twelve environmental variables were selected from natural, landscape pattern and socioeconomic dimensions to detect the dominant factors...

Water quality has suffered as humans have increased nutrient inputs across the landscape. In many cases, management actions to reduce nutrient inputs have not been met with concomitant ecosystem responses. These missed expectations are partly due to the continued slow delivery of nutrient-enriched groundwater pre-dating input reductions resulting f...

To reveal the hydrological effects on changes in land use and landscape pattern of the Wuhua River Basin (hereinafter referred to as the River Basin), this study investigated the upstream of Hezikou Hydrological Station on the Wuhua River; simulated the monthly runoff and sediment yield of the River Basin in a 25-year period (1986–2010) based on th...

Climate change can have critical impacts on ecosystem services (ESs) and their inter-relationships, especially for water-related services. However, there has been little work done on characterizing the current and future changes in these services and their inter-relationships under a changing climate. Based on the revised universal soil loss equati...

The United Nations has adopted 17 Sustainable Development Goals (SDGs) with 169 targets. International trade has substantial influences on global sustainability and human well-being. However, little is known about the impacts of international trade on progress towards achieving the SDG targets. Here we show that international trade positively affec...

The impacts of climate change and human activities on the surface runoff in the Wuhua River Basin (hereinafter referred to as the river basin) are explored using the Mann–Kendall trend test, wavelet analysis, and double-mass curve. In this study, all the temperature and precipitation data from two meteorological stations, namely, Wuhua and Longchua...

Non- point source pollution is one of the most severe problems impacting water environments. Identifying potential risk areas and risk paths contributing to non- point source pollution is the solution to this problem. This study introduces the minimum cumulative resistance model of landscape ecology, which is based on land use and soil mapping at a...

The aim of this study is to understand the change rules and tendencies of extreme climate events of Hanjiang River Basin located in hot and humid mountain region and to provide a scientific basis for the reduction of meteorological disasters prevention.Based on daily data for temperature and precipitation from China meteorological data service shar...

Context Human demands for ecosystem services (ES) have tremendously changed the landscape and led to degradation of ecosystems and associated services. The resolving of current eco-environmental problems calls for better understanding of the spatially-explicit ES interactions to guide targeted land-use policy-making. Objectives We propose a framewo...

Based on three periods of land-use data on Dongyuan county, a discussion was conducted on the resultant variations in ecosystem service value with land use changes in Dongjiang River basin. The results showed that: (1) the primary type of land use was forest land; the areas of forest land and waters were on the increase by phases, farmland area rem...

Based on the daily meteorological data of 12 meteorological stations in Hanjiang Ｒiver Basin from 1961 to 2013， Penman－Monteith formula is used to calculate the reference crop evapotranspiration ( ET0) ， and the spatial characteristics of ET0 in Hanjiang Ｒiver Basin and its influencing factors are analyzed by Mann－Kendall test, Kring interpolation，...