Crop yield and soil organic matter after long-term straw return to soil in China

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• 作者：Jinzhou Wang ; Xiujun Wang ; Minggang Xu ; Gu Feng…
• 关键词：Straw return ; Soil organic carbon ; Total nitrogen ; Crop yield ; Carbon sequestration ; Long ; term experiment
• 刊名：Nutrient Cycling in Agroecosystems
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：102
• 期：3
• 页码：371-381
• 全文大小：969 KB
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• 作者单位：Jinzhou Wang (1) (2) (3)
  Xiujun Wang (3) (4)
  Minggang Xu (1)
  Gu Feng (2)
  Wenju Zhang (1)
  Chang’ai Lu (1)
  
  1. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
  2. College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100094, China
  3. Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, 20740, USA
  4. College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Soil Science and Conservation
  
• 出版者：Springer Netherlands
• ISSN：1573-0867

文摘

Straw has been commonly incorporated to maintain soil fertility and crop productivity in China, but effects of long-term straw incorporation on crop yield, soil organic carbon (SOC) and total nitrogen (TN) have not been thoroughly evaluated. Thus, this study analyzed data collected in long-term (>10-year) trials across the major agricultural zones of China. Across the trials, relative to straw removal, straw return significantly increased crop yield, SOC and TN (by 7.0, 10.1 and 11.0?%, respectively). In some trials with winter wheat in northern China, straw return reduced yield by 0.6-.1?%. The effects of straw return on SOC and TN were not significantly affected by experimental duration, land use type and cropping system, but positively and linearly related to the inputs of straw-C and -N, respectively. Interestingly, SOC and TN responses to straw return were decoupled in upland and upland-paddy soils in China, but not in paddy soils. Mean values of straw-C sequestration efficiency (7.7, 10.3 and 9.4?%, under corn, wheat and rice, respectively) indicate that 100?% straw return could increase SOC by 281.7 Tg C in 18?years (the mean experimental period of the considered studies) in China. Our analyses demonstrate that straw return is an effective practice for sustaining crop productivity and soil fertility in large parts of China, but site-specific factors should be considered.