Nutrient Cycling and Balance of P for Wheat Production in China

2014 ◽  
Vol 651-653 ◽  
pp. 260-264
Author(s):  
Li Min Chuan ◽  
Huai Guo Zheng ◽  
Cui Ping Tan ◽  
Su Fen Sun ◽  
Jun Feng Zhang
Keyword(s):  
Nutrient Cycling ◽  
Yangtze River ◽  
Negative Impact ◽  
Northwest China ◽  
P Uptake ◽  
Central China ◽  
The Yangtze River ◽  
North Central ◽  
Wheat Production ◽  
P Fertilizer

In this study, the input and output parameters of Phosphorus (P) for wheat production system were collected from the year 2000 to 2011 to evaluate the nutrient cycling and balances in North Central China, the Middle and Lower Reaches of the Yangtze River and Northwest China. The results showed that the P fertilizer application rates for each region were 44.5, 39.7 and 42.3 kg P/ha, the P brought from previous crop were 14.8, 1.6 and 2.6 kg/ha, and brought from seeding were 1.5, 1.0 and 0.9 kg/ha, respectively. The P input from atmospheric deposition and irrigation were considered zero. The P uptake by harvest in above-ground plant in North Central China, the Middle and Lower Reaches of the Yangtze River and Northwest China were 41.2, 53.2 and 17.0 kg/ha. As a result, the P balance in North Central China and Northwest China were both showing surplus by 19.6 and 28.8 kg/ha, and in the Middle and Lower Reaches of the Yangtze River showed deficiency. It is suggested that we need to adjust the P fertilizer input in China, in order to maintain the sustainable soil fertility and avoid the negative impact on the environment.

Characteristics of K Nutrient Input/Output and its Balance for Wheat Season in China

2014 ◽  
Vol 678 ◽  
pp. 720-725 ◽  
Author(s):  
Li Min Chuan ◽  
Huai Guo Zheng ◽  
Cui Ping Tan ◽  
Su Fen Sun ◽  
Jun Feng Zhang
Keyword(s):  
Yangtze River ◽  
Northwest China ◽  
Fertilizer Application ◽  
Central China ◽  
The Yangtze River ◽  
North Central ◽  
Previous Crop ◽  
Application Rates ◽  
K Fertilizer

In this study, the input and output parameters of potassium (K) for wheat season were collected from 2000 to 2011 to evaluate the nutrient cycling and balance in North Central China, the Middle and Lower Reaches of the Yangtze River and Northwest China. The results showed that the K fertilizer application rates for each region were 74.7, 102.9 and 50.6 kg K/ha, the K brought from previous crop were 99.5, 19.8 and 23.4 kg K/ha, and brought from seeding were 1.0, 0.8 and 0.7 kg K/ha, respectively. The K input from atmospheric deposition and irrigation were all considered zero. The K uptake by harvest in above-ground plant in North Central China, the Middle and Lower Reaches of the Yangtze River and Northwest China were 131.8, 159.9 and 119.8 kg K/ha. As a result, The K balance in North Central China showed surplus by 43.6 kg/ha, while in the Middle and Lower Reaches of the Yangtze River and Northwest China, the K balance were both deficiency by 36.4 and 45.1 kg/ha, even though it did not affect the crop yield. While it is suggested that we need to adjust the K fertilizer application in a long term, in order to maintain the sustainable soil fertility.

scholarly journals Net Greenhouse Gas Emissions from Agriculture in China: Estimation, Spatial Correlation and Convergence

2019 ◽  
Vol 11 (18) ◽  
pp. 4817 ◽  
Author(s):  
Haoyue Wu ◽  
Hanjiao Huang ◽  
Jin Tang ◽  
Wenkuan Chen ◽  
Yanqiu He
Keyword(s):  
Greenhouse Gas ◽  
Spatial Correlation ◽  
Yangtze River ◽  
Regional Cooperation ◽  
Negative Impact ◽  
Ghg Emissions ◽  
Coastal Region ◽  
The Yangtze River ◽  
Agricultural Ecosystem ◽  
Convergence Test

The agricultural ecosystem has dual attributes of greenhouse gas (GHG) emission and absorption, which both influence the net amount of GHG. To have a clearer understanding of the net GHG effect, we linked up the emission and absorption of the agricultural ecosystem, estimated the net emissions of 30 provinces in China from 2007 to 2016, then explored the spatial correlation from global and local perspectives by Moran’s I, and finally tested the convergence of the net emissions by α convergence test, conditional β convergence test and spatial econometric methods. The results were: (1) The average of provincial agricultural net GHG emissions was around 4999.916 × 104 t, showing a fluctuating trend in the 10 years. Meanwhile, the gaps among provinces were gradually widening, as the provinces with high emissions were mainly agglomerated in the middle reaches of the Yangtze River, while those with less emissions mainly sat in the northwest. (2) The net emissions correlated spatially in close provinces. The agglomeration centers were located in the middle reaches of the Yangtze River and the northern coastal region, showing “high–high” and “low–low” agglomeration, respectively. (3) The net emissions did not achieve α convergence or conditional β convergence in the whole country, but the growth rate had a significant positive spillover effect among adjacent provinces, and two factors, the quantity of the labor force and the level of agricultural economy, had a negative impact on the rate. It is suggested that all provinces could strengthen regional cooperation to reduce agricultural net GHG emissions.

Sources and fate of high levels of ammonium in surface water and shallow groundwater of the Jianghan Plain, Central China

2017 ◽  
Vol 19 (2) ◽  
pp. 161-172 ◽  
Author(s):  
Yao Du ◽  
Teng Ma ◽  
Yamin Deng ◽  
Shuai Shen ◽  
Zongjie Lu
Keyword(s):  
Surface Water ◽  
River Basin ◽  
Yangtze River ◽  
Yangtze River Basin ◽  
Shallow Groundwater ◽  
Central China ◽  
The Yangtze River ◽  
Jianghan Plain ◽  
The Yangtze River Basin ◽  
Mixed Origin

Ammonium is of anthropogenic, natural and mixed origin in surface water, aquifer and intermediate aquitard between them, respectively, within the Yangtze River Basin.

scholarly journals Grain Size and Pollen of Sediments in Wanghu Lake (Central China) Linked to Hydro-Environmental Changes

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 45
Author(s):  
Huadong Shen ◽  
Zhongbo Yu ◽  
Ge Yu ◽  
Xiaoli Shi
Keyword(s):  
Grain Size ◽  
Land Cover ◽  
Yangtze River ◽  
Environmental Changes ◽  
Sediment Cores ◽  
Central China ◽  
Land Cover Changes ◽  
The Yangtze River ◽  
Watershed Hydrology ◽  
Lake Catchment

Grain size of lake sediments is often measured in paleolimnological studies, especially investigations of past paleoclimatic and paleohydrologic changes. The implications of such measures, however, remain unclear, since watershed hydrology and the related transfer of materials to the lake are affected by local climate variables, hydrological shifts, and vegetation cover variables. Sediment from Wanghu Lake in the middle reaches of the Yangtze River have apparently been affected by land cover changes and lake-river system transitions caused by a sluice gate built at Fuchi in 1967. These changes influenced the watershed hydrology, thereby confounding paleoclimatic and paleohydrologic interpretations by proxy records in sediment cores. We collected sediment cores from the center of Wanghu Lake and analyzed trends in pollen and physical properties through sedimentary records to investigate land cover changes and hydrological transitions during the past 90 years. The grain size of the sediment core increased with precipitation and the significant relationships between pollen and grain size after 1967 indicated that sediment transfer to the lake was controlled by rainfall and land cover changes due to human-induced deforestation and farming in the lake catchment. Interestingly before 1967, there was no significant relationship between the pollen and grain size or between the precipitation and grain size, indicating that the sediment of WanghuLake was not simply from the lake catchment. The different relationships patterns before and after 1967 indicated that the sediments in the lake were not only transported following precipitation and discharge from the lake catchment but also came from the Yangtze River draining back into the lake during the flood seasons before 1967. These results highlight matters needing attention and the potential application of grain size of sediments for reconstructions of past hydro-environmental changes.

scholarly journals Impact of collaborative innovation on green total factor productivity in Yangtze River Economic Belt: Analysis based on endogenous spatial-temporal weight matrix

2021 ◽  
Author(s):  
lei Wu ◽  
Xiaoyan Jia ◽  
Jie Lv ◽  
Li Gao
Keyword(s):  
Total Factor Productivity ◽  
Yangtze River ◽  
Negative Impact ◽  
Positive Impact ◽  
Spatial Interaction ◽  
Evaluation Index System ◽  
Weight Matrix ◽  
The Yangtze River ◽  
Factor Productivity ◽  
Collaborative Innovation

Abstract Technological innovation can promote high-quality economic growth. This paper discusses the promotion of green total factor productivity from the perspective of collaborative innovation in the Yangtze River Economic Belt. Firstly, the evaluation index system of collaborative innovation level is constructed from two aspects of collaborative innovation elements and collaborative innovation environment. Then the entropy method is used to measure its development level. The results show that the collaborative innovation level of provinces in the Yangtze River Economic Belt presents an increasing trend year by year. Meanwhile, there are regional differences, which is characterized by 'high in the middle reaches, middle in the downstream and low in the upstream' Secondly, the SDM model based on endogenous spatio-temporal weight matrix is constructed to analyze the influencing factors of green total factor productivity. The results show that collaborative innovation in the Yangtze River Economic Belt has significant negative impact on green total factor productivity in terms of spatial interaction and fiscal expenditure also has a negative impact. The spatial interaction between environmental protection and opening up has a significant positive impact on green total factor productivity. However, the spatial interaction between industrial structure and human capital on green total factor productivity is not obvious. Finally, this paper puts forward some policy suggestions to improve green total factor productivity.

scholarly journals Perceived Importance and Bundles of Ecosystem Services in the Yangtze River Middle Reaches Megalopolis, China

2021 ◽  
Vol 9 ◽  
Author(s):  
Guanshi Zhang ◽  
Xiu Zhang ◽  
Long Xie ◽  
Qi Zhang ◽  
Dongsheng Liu ◽  
...  
Keyword(s):  
Yangtze River ◽  
Principal Component ◽  
Living Environment ◽  
Central China ◽  
The Yangtze River ◽  
Ecological Stability ◽  
Significant Difference ◽  
Perceived Importance ◽  
Local Residents ◽  
Environment Service

In this study, a survey with 4,580 residents in the Yangtze River Middle Reaches Megalopolis, central China, was conducted to assess the perceived importance of local ESs. Then, principal component analysis was used to identify their perceived coincidence (i.e., ES bundles), and an automatic linear model was used to reveal how the perceived ES importance and ES bundles were associated with socioenvironmental factors, including demographics, environmental awareness, and living environment. Our results showed that the provisioning ESs, especially water supply, had relatively higher perceived importance. There was no significant difference in perceived ES importance and ES bundles between experts and ordinary residents; thus, experts may recommend practices that meet the local residents’ wishes in the YRMRM. In addition, we disclosed three bundles of perceived ES (i.e., green environment service bundle, ecological stability service bundle, and grain service bundle), which encompassed ES from different ES categories. Potential tradeoff existed in different ES bundles, mainly due to the divergent preferences of different residents. For example, residents with more bus services near the residence tended to perceive green environment service bundle as more important, but perceive ecological stability service bundle as less important. This study adds important first-hand empirical data to the field of the public preferences of local residents for a region of high economic and ecological importance in China, which could provide more information and scientific basis for socially just and sustainable region environmental planning and management.

scholarly journals Regional Temporal and Spatial Trends in Drought and Flood Disasters in China and Assessment of Economic Losses in Recent Years

2018 ◽  
Vol 11 (1) ◽  
pp. 55 ◽  
Author(s):  
Jieming Chou ◽  
Tian Xian ◽  
Wenjie Dong ◽  
Yuan Xu
Keyword(s):  
Spatial Distribution ◽  
Extreme Precipitation ◽  
Yangtze River ◽  
Central China ◽  
Economic Losses ◽  
Climate Indices ◽  
The Yangtze River ◽  
Flood Disasters ◽  
Increasing Trend ◽  
Temporal And Spatial

Understanding the temporal and spatial distribution in disasters plays an important role in disaster risk management. The present study aims to explore the long-term trends in drought and floods over China and estimate the economic losses they cause. A peak-over-threshold approach is used to identify flood peaks, and the relationship between the disasters and climate indices is investigated using Poisson regression. The major results are as follows: (1) the northeastern part of China was severely affected by drought disasters (average damaged area was 6.44 million hectares); (2) the northern part of East China and Central China upstream of the Yangtze River were severely affected by flood disasters (average damaged area was 3.97 million hectares); (3) in the Yangtze River Basin, there are increasing trends in terms of drought and extreme precipitation, especially upstream of the Yangtze River, accompanied by severe disaster losses; and (4) by combining the trends in drought and extreme precipitation days with the spatial distribution of damaged areas, the study indicates that the increasing trend in droughts has shifted gradually from north to south, and the increasing trend in extreme precipitation gradually has shifted from south to north.

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