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长期不同耕作与秸秆还田对土壤养分库容及重金属Cd的影响

汤文光1,肖小平1,唐海明1,张海林2**,陈阜2,陈中督2,薛建福2,杨光立1   

  1. (1湖南省土壤肥料研究所, 长沙 410125; 2中国农业大学农学与生物技术学院, 北京100193)
  • 出版日期:2015-01-18 发布日期:2015-01-18

Effects of long-term tillage and rice straw returning on soil nutrient pools and Cd concentration.

TANG Wen-guang1, XIAO Xiao-ping1, TANG Hai-ming1, ZHANG Hai-lin2, CHEN Fu2, CHEN Zhong-du2, XUE Jian-fu2, YANG Guang-li1   

  1. (1Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China; 2College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China)
  • Online:2015-01-18 Published:2015-01-18

摘要:

于2005—2013年在湖南宁乡双季稻田开展免耕秸秆还田(NTS)、翻耕秸秆还田(CTS)、翻耕秸秆不还田(CT)、旋耕秸秆还田(RTS)4种不同耕作方式与秸秆还田试验,分析不同耕作方式与秸秆还田对土壤养分含量、养分库容量及重金属Cd的影响,为稻田合理耕作与重金属Cd污染修复提供理论依据.结果表明: 耕作措施与秸秆还田主要影响0~10 cm耕层土壤性状;长期翻耕和旋耕提高了土壤养分含量,增强了土壤通气性,但耕层变浅,养分库容降低,土壤Cd含量显著偏高,水稻植株地上部分富集Cd能力相对较低;长期免耕增加了表层土壤容重,土壤养分含量较低,但养分库容相对较高,水稻植株地上部分富集Cd能力较强;秸秆还田显著增加了土壤养分含量和阳离子交换量,增加了耕层深度和土壤养分库容量,增强了土壤的保肥能力,但同时也将秸秆中富集的Cd重新归还到稻田土壤中,不利于土壤Cd的转移修复.因此,长期单一耕作方式和长期秸秆还田均存在一定弊端,需改进耕作和秸秆还田方式,如实行翻耕、旋耕与免耕相结合的土壤轮耕或深松耕,以及减少秸秆还田量或实行秸秆轮还,在改善土壤肥力的同时,实现土壤污染的有效修复.

 

Abstract:

The objective of this study was to assess the effects of tillage and straw returning on soil nutrient and its pools, and soil Cd concentration, and to identify the strategies for rational tillage and remediation of Cd contaminated paddy fields. The experiment was established with notillage with straw retention (NTS), rotary tillage with straw incorporation (RTS), conventional plow tillage with straw incorporation (CTS), conventional plow tillage with straw removed (CT) from 2005 to 2013. The results indicated that tillage and rice straw retention had a great impact on soil properties at 0-10 cm soil depth. The soil aeration, and concentrations of soil nutrient and soil Cd increased under CTS, CT, and RTS. Due to the shallow plow layers, soil nutrient pools and the Cd concentration in rice shoot decreased in long-term tilled soil. Under long-term no-tillage, the soil bulk, soil nutrient pools and Cd concentration in rice shoot increased, but concentrations of soil nutrients decreased. In addition, rice straw returning significantly increased the soil nutrient concentrations, cation exchange capacity, depth of plow layer, and soil nutrient pools. However, the Cd in the rice straw was also returned to the soil by rice straw returning, which would not benefit the remediation of soil Cd. Therefore, it is necessary to improve tillage and straw retention practices due to the disadvantages of longterm continuous single tillage method and rice straw returning practices. Some recommended managements (e.g., rotational tillage or subsoiling, reducing straw returning amount, and rotational straw returning) could be good options in enhancing soil fertility and remedying soil pollution.