自然资源学报 ›› 2017, Vol. 32 ›› Issue (5): 755-764.doi: 10.11849/zrzyxb.20160506

• 资源生态 • 上一篇    下一篇

秸秆还田模式对农田土壤碳库特性及产量的影响

王海候1,3, 金梅娟1,3, 陆长婴1,3, 施林林1,3, 周新伟1,3, 沈明星1,3,*, 季国军2, 张永春2,3   

  1. 1. 江苏太湖地区农业科学研究所,江苏 苏州 215155;
    2. 江苏省农业科学院资源与环境研究所/农业部江苏耕地保育科学观测实验站, 南京 210014;
    3. 农业部苏州水稻土生态环境重点野外科学观测试验站,江苏 苏州 215155
  • 收稿日期:2016-05-16 修回日期:2016-09-11 出版日期:2017-05-20 发布日期:2017-05-20
  • 通讯作者: 沈明星(1968- ),男,江苏吴江人,研究员,主要从事循环农业方面研究。E-mail: smxwwj@163.com
  • 作者简介:王海候(1979- ),男,江苏启东人,副研究员,硕士,主要从事土壤质量管理与农业废弃物循环利用。E-mail: wanghaihou@126.com
  • 基金资助:
    农业部公益性行业(农业)科研专项(201503122); 江苏省科技支撑项目(BE2013334); 江苏省农业科技自主创新基金项目(CX(12)1002)

Effects of Patterns of Returning Straw to Field on Soil Carbon Pool and Yield in Rice-wheat Double Cropping Systems

WANG Hai-hou1,3, JIN Mei-juan1,3, LU Chang-ying1,3, SHI Lin-lin1,3, ZHOU Xin-wei1,3, SHEN Ming-xing1,3, JI Guo-jun2   

  1. 1. Taihu Research Institute of Agricultural Sciences, Suzhou 215155, China;
    2. Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Scientific Observing and Experimental Station of Arable Land Conservation (Jiangsu), Nanjing 210014, China;
    3. Key Scientific Observation & Experiment Station Paddy Field Eco-environment, Suzhou, Ministry of Agriculture, Suzhou 215155, China
  • Received:2016-05-16 Revised:2016-09-11 Online:2017-05-20 Published:2017-05-20
  • Supported by:
    Public Welfare and Industry Special Fund Project of the Ministry of Agriculture, No.201503122; Jiangsu Province Science and Technology Support Project, No.BE2013334; Jiangsu Province Agricultural Science and Technology Innovation Fund Projects, No.CX(12)1002

摘要: 为探明南方稻麦两熟制农田秸秆还田模式对土壤总有机碳、活性有机碳、碳库管理指数和稻麦产量的影响,论文通过8 a的水稻-小麦轮作田间定位试验,设置了4个秸秆还田模式处理:秸秆不还田(CK)、秸秆稻麦季均还田(RW)、仅麦秸稻季还田(W)、仅稻秸麦季还田(R)。结果表明,与CK处理相比,秸秆还田显著提高了0~20 cm土壤的总有机碳、活性有机碳、稳定态有机碳(P<0.05);不同秸秆还田模式处理之间的土壤总有机碳、稳定态有机碳差异均不显著(P>0.05),RW处理的活性有机碳、碳库活度指数、碳库管理指数与R处理无显著差异性(P>0.05),显著大于W处理(P<0.05);RW与R处理的水稻产量均值无显著差异性(P>0.05),显著大于W处理;活性有机碳、碳库管理指数与水稻产量均值呈极显著相关(P<0.01),与小麦产量均值关系不密切(P>0.05);上述结果表明,与稻麦两季还田模式相比,南方稻麦两熟制农田实施仅稻秆麦季还田模式,并不影响作物稳产性与土壤地力的提升。

关键词: 产量, 稻麦两熟制, 活性有机碳, 秸秆还田模式, 碳库管理指数, 土壤

Abstract: Straw returning helps to decrease the environment pollution, moreover, the rational utilization of straw resources benefits sustainable development of soil fertility, soil conservation, and the agricultural ecosystem. An eight-year field experiment was conducted in Suzhou City, Jiangsu Province to study the effect of different patterns of straw returning to field on labile organic (LOC), carbon pool management index (CPMI) and crop yields in a typical rice-wheat rotation region—the Taihu Lake region. The experiment consisted of four patterns of returning straw to the field: rice straw alone (named as “R”), wheat straw alone (named as “W”), straw of both rice and wheat (named as “RW”) and no straw returning to field (CK). The results indicated that returning straw significantly increased the content of total organic carbon (TOC), LOC, and non-labile organic (NLOC) at the soil depth of 0-20 cm interval compared to no straw returning treatment. The TOC significantly increased by 15.34%-16.97%, and the LOC content significantly increased by 16.62%-27.39% (P<0.05). No significant difference on TOC or NLOC was observed among different treatments. There were no significant differences of LOC, CPI, CPMI between the treatments of RW and R, while the value of LOC, CPI, CPMI of RW were higher in the treatment of W. The mean rice yield increased by 4.53% in RW and 4.07% in R treatment respectively compared to CK treatment (P<0.05), and no significant difference was observed between W and CK treatments. There were no significant differences of LOC between RW and R treatments (P>0.05), while significant differences were observed between the treatments of RW and W (P<0.05). LOC and CPMI were significantly correlated to the mean yield of rice (P<0.05), while they were not correlated with mean yield of wheat (P>0.05). It was concluded that compared with the mode of returning both rice and wheat straws to field, the mode of only returning rice straw to field in the wheat growing season does not affect the crop yield stability and soil fertility improvement. However, it is recommended to reduce or avoid returning wheat straw in a rice-wheat double cropping system in South China.

Key words: carbon pool management index, labile organic carbon, patterns of straw returning to field, rice-wheat double cropping system, yield, soil

中图分类号: 

  • S158.5