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生态学杂志 ›› 2009, Vol. 28 ›› Issue (11): 2279-2285.

• 研究报告 • 上一篇    下一篇

不同耕作方式对内蒙古旱作农田土壤微生物量和作物指标的影响

孙建1;刘苗1;李立军1**;刘景辉1;KENNETH Dean Sayre2   

  1. 1内蒙古农业大学,呼和浩特 010018;2国际玉米小麦改良中心,墨西哥 06600
  • 出版日期:2009-11-10 发布日期:2009-11-10

Effects of different tillage modes on rain-fed farmland soil microbial biomass and crop indices in Inner Mongolia.

SUN Jian1;LIU Miao1;LI Li-jun1;LIU Jing-hui1;KENNETH Dean Sayre2   

  1. 1Inner Mongolia Agricultural University, Huhhot 010018, China;2International Maize and Wheat Improvement Center (CIMMYT), 06600, Mexico
  • Online:2009-11-10 Published:2009-11-10

摘要: 研究了不同耕作方式下土壤微生物量碳、氮、磷及玉米全生育期叶面积指数、株高和干物质积累量的动态变化,并对土壤指标与作物指标之间的关系进行分析。结果表明:免耕有利于提高土壤微生物量碳、氮、磷含量。不同处理微生物量均表现为:免耕留高茬覆盖>免耕留低茬覆盖>免耕留高茬>免耕留低茬>传统耕翻;土壤微生物量碳、氮、磷含量随土层深度的增加而呈降低趋势。除传统耕翻微生物量碳在10~20 cm土层深度含量提高外,其他处理微生物量碳、氮、磷均表现为0~10 cm>10~20 cm>20~30 cm>30~40 cm土层深度;土壤生物量碳、氮、磷随季节的变化趋势基本一致,不同处理土壤生物量含量均为7月份含量最高、6月份次之、10月份最低;叶面积指数全生育期呈单峰曲线变化,株高和干物质积累呈S曲线变化。不同处理之间作物指标均表现为免耕留高茬覆盖>免耕留低茬覆盖>免耕留高茬>免耕留低茬>传统耕翻;土壤微生物量与作物指标之间的相关度较高,特别是微生物量磷,土壤微生物量在一定程度上可以反映作物的生长状况。研究结果能够很好地揭示在黄河流域内蒙古农田旱作区实施免耕的优势。

关键词: 生态系统服务功能, 生态调节功能, 海南岛

Abstract: This paper studied the dynamic changes of soil microbial biomass and crop indices on a degraded rain-fed maize field in the Qingshuihe County of Inner Mongolia under no tillage with low stubble (NL), no tillage with high stubble (NH), no tillage with low stubble and residues (NLS), no tillage with high stubble and residues (NHS), and conventional tillage (CT). No tillage increased the soil microbial biomass C, N, and P, with the sequence of treatments NHS>NLS>NH>NL>CT. Except that the soil microbial biomass C in CT had an increase in 10-20 cm soil layer, the soil microbial biomass C, N, and P in all treatments decreased with soil depth. The soil microbial biomass C, N, and P had the same seasonal pattern, being the highest in July, secondly in June, and the lowest in October. The LAI in whole growth period varied in unimodal form, while the plant height and dry matter accumulation were in “S” form. All the crop indices followed the order of NHS>NLS>NH>NL>CT. Soil microbial biomass, its P in particular, had positive correlations with crop indices. Our results revealed the advantages of no tillage on rainfed farmlands in Inner Mongolia.

Key words: Ecosystem services, Ecological regulation services, Hainan Island