严波,贾志宽,韩清芳,杨宝平,聂俊峰.不同耕作方式对宁南旱地土壤团聚体的影响[J].干旱地区农业研究,2010,28(3):58~63
不同耕作方式对宁南旱地土壤团聚体的影响
Effects of different tillage on soil aggregates in the arid areas of South Ningxia
  
DOI：10.7606/j.issn.1000-7601.2010.03.11
中文关键词:  耕作方式  土壤团聚体  宁南旱区
英文关键词:tillage  soil aggregates  the arid areas of South Ningxia
基金项目:“十一五”国家科技支撑计划旱农课题(2006BAD29B03)；国家科技支撑计划节水共性技术研究(2007BAD88B10)
作者单位
严波 西北农林科技大学干旱半干旱研究中心,陕西 杨凌 712100 
贾志宽 西北农林科技大学干旱半干旱研究中心,陕西 杨凌 712100
农业部旱地作物生产与生态重点开放实验室,陕西 杨凌 712100 
韩清芳 西北农林科技大学干旱半干旱研究中心,陕西 杨凌 712100
农业部旱地作物生产与生态重点开放实验室,陕西 杨凌 712100 
杨宝平 西北农林科技大学干旱半干旱研究中心,陕西 杨凌 712100
农业部旱地作物生产与生态重点开放实验室,陕西 杨凌 712100 
聂俊峰 西北农林科技大学干旱半干旱研究中心,陕西 杨凌 712100
农业部旱地作物生产与生态重点开放实验室,陕西 杨凌 712100 
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中文摘要:
      在宁南旱区对试验耕地定位实行连年传统翻耕(CT)、隔年免耕—深松(NT→ST)及深松—免耕(ST→NT)三种不同处理。用干筛法和湿筛法对连续3年处理后土壤团聚体的变化进行测定,分析结果表明,干筛法中NT→ST处理在040 cm土层中>0.25 mm的机械稳定性团聚体比处理前和CT处理分别高33.11%、29.51%;ST→NT处理在040 cm土层中>0.25 mm机械稳定性团聚体含量比处理前和CT处理分别高40.51%、36.91%。湿筛法中NT→ST处理在030 cm土层中>0.25 mm的水稳性团聚体含量比处理前高7.33%,NT→ST处理在010 cm土层>0.25 mm的水稳性团聚体比CT处理高1.47%,而在1040 cm土层NT→ST处理和CT>0.25 mm的水稳性团聚体含量差异不显著;ST→NT处理在040 cm土层中>0.25 mm水稳性团聚体含量比处理前和CT处理分别高10.75%、10.12%。分析结果同时说明,采用深松—免耕(ST→NT)轮耕方式更有利于土壤团聚体含量和稳定性的增加。
英文摘要:
      In this study, three different tillage treatments of conventional tillage(CT), the following year no-tillage-subsoiling(NT→ST) and subsoiling-no-tillage(ST→NT) were conducted on the arid areas of South Ningxia. After 3 years of consistent tillage treatment, using dry sieving and wet sieving methods, the changing of soil aggregates was ana-lyzed and tested. The results showed that the content of > 0.25 mm mechanical aggregates in 0 ~40 cm layers of NT→ ST increased by 33.11 % and 29.51 % and ST→NT increased by 40.51 % and 36. 91 % compared with those of natural soil and CT. The content of > 0.25 mm water-stable aggregates of NT→ST in 0~ 30 cm layers increased by 7.33% compared with that of natural soil, and that in 0~10 cm layers increased by 1.47% compared with CT, but that in 10~40 cm layers had no significant difference compared with CT; Compared with those of natural soil and CT, the content of > 0.25 mm water-stable aggregates in 0~10 cm layers of ST→NT increased by 10.75% and 10.12 %. The results also show that subsoiing no-tillage(ST→NT) is more conducive to increase the stability of soil aggregates content.
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