Agricultural landscape change in China's Yangtze Delta, 1942–2002: A case study

Wu, Jian; Xu, Chuncheng; HongSheng, Xiao; Wang, Hongqing; Yang, Linzhang; Ellis, Erle C.

doi:10.1016/j.agee.2008.11.008

Cited by 47 publications

(22 citation statements)

References 36 publications

(41 reference statements)

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“…Due to the ambiguous property rights, an informal rental market, and the vacuum of state regulation, urban village is viewed as an unregulated asset despite its unruliness and disorder (Liu et al, 2010;Xu et al, 2011). These processes have exacerbated the fragmentation within built-up areas and transformed the traditional agricultural landscapes became lost, replaced by fragmented, transformed and isolated urbanscape (Wu et al, 2009;Yu and Ng, 2007). Most of the built-up area in rapidly developing cities, especially in regions where 'local urban sprawl' is interwoven with 'urban spillover', consists of industrial land and residential land, which often account for more than 25% and 35% of the total area, respectively (MOHURD, 2009).…”

Section: Introductionmentioning

confidence: 96%

Assessing the fragmentation of construction land in urban areas: An index method and case study in Shunde, China

Wei

Zhang

2012

Land Use Policy

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Section: Introductionmentioning

confidence: 96%

Assessing the fragmentation of construction land in urban areas: An index method and case study in Shunde, China

Wei

Zhang

2012

Land Use Policy

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“…The lower reaches of the Yangtze River, located in eastern China, has long been one of the most densely populated agricultural regions and it has a very long history of productive rice-based agriculture (Wu et al 2009). Anthropogenic reactive N has far exceeded natural biologically fixed N in natural terrestrial ecosystems in this region .…”

Section: Introductionmentioning

confidence: 99%

Nitrogen budget and riverine nitrogen output in a rice paddy dominated agricultural watershed in eastern China

et al. 2010

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The nitrogen (N) budget calculation approach is a useful means of evaluating the impact of human activity on the N cycle. Field scale N budget calculations may ignore the interactions between landscapes, and regional scale calculations rely on statistical data and indirect parameters. Watershed scale budget calculations allow for a more direct quantification of N inputs and outputs. We conducted N budget calculations for a rice paddydominated agricultural watershed in eastern China for 2007-2009, based on intensive monitoring of stream N dynamics, atmospheric deposition, ammonia (NH 3 ) volatilization and household interviews about Nrelated agricultural activities. The results showed that although total N input to the watershed was up to 280 kg N ha -1 year -1 , riverine discharge was only 4.2 kg N ha -1 year -1 , accounting for 1.5% of the total N input, and was further reduced to 2.0 kg N ha -1 year -1 after reservoir storage and/or denitrification removal. The low riverine N output was because of the characteristics of the rice paddydominated landscape, which intercepts run-off and enhances soil denitrification. The watershed actually purified the N in rainwater, as N concentrations in river discharge were much lower than those in rain water. Major N outputs included food/feed export, NH 3 volatilization from chemical fertilizer and manure, and emissions from crop residue burning. Net reactive gaseous emissions (emissions minus deposition) accounted for 5.5% of the total N input, much higher than riverine discharge. Therefore, the agricultural N cycle in such paddy-dominated watersheds impacts the environment mainly through gas exchange rather than water discharge.Keywords Eastern China Á Nitrogen budget Á Reservoir Á Riverine discharge Á Watershed Abbreviations NANI Net anthropogenic nitrogen input N Nitrogen TN Total dissolved nitrogen

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“…This is significant, since just a 3% drop in China's cereal production will claim 10% of the world export market and can potentially jeopardize global food security [18]. Also, in China's Yangtze Delta, for example, rice paddy areas have decreased by a dramatic 22% over the last six decades, while an increase has been seen for urban areas (8%) and aquaculture (14%) [19]. Global wheat stocks reached historic lows this decade and wheat prices increased by about 30% in 2008 [20], resulting in further structural changes in global grain markets, and increased rice prices in recent years have also endangered food security [14,21].…”

Section: Introductionmentioning

confidence: 99%

“…Crop type information is crucial for water use assessment, productivity assessments, and many other practical applications of data and maps at local levels. Accurate crop classification is the key to determining many other crop specific parameters [70] such as water use by crops, water productivity, biomass, yield, and carbon sequestration [19,71].…”

Section: Referencesmentioning

confidence: 99%

A Holistic View of Global Croplands and Their Water Use for Ensuring Global Food Security in the 21st Century through Advanced Remote Sensing and Non-remote Sensing Approaches

Thenkabail

Hanjra²,

Dheeravath³

et al. 2010

Remote Sensing

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This paper presents an exhaustive review of global croplands and their water use, for the end of last millennium, mapped using remote sensing and non-remote sensing approaches by world's leading researchers on the subject. A comparison at country scale of global cropland area estimated by these studies had a high R 2 -value of 0.89-0. of blue water and the rest from rain that falls over irrigated croplands). However, 1.6 to 2.5 times the blue water required by irrigated croplands is actually withdrawn from reservoirs or pumping of ground water, suggesting an irrigation efficiency of only between 40-62 percent. The weaknesses, trends, and future directions to precisely estimate the

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Agricultural landscape change in China's Yangtze Delta, 1942–2002: A case study

Cited by 47 publications

References 36 publications

Assessing the fragmentation of construction land in urban areas: An index method and case study in Shunde, China

Assessing the fragmentation of construction land in urban areas: An index method and case study in Shunde, China

Nitrogen budget and riverine nitrogen output in a rice paddy dominated agricultural watershed in eastern China

A Holistic View of Global Croplands and Their Water Use for Ensuring Global Food Security in the 21st Century through Advanced Remote Sensing and Non-remote Sensing Approaches

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