10 a保护性耕作下轮作系统土壤碳氮磷生态化学计量特征

陆姣云; 王振南; 杨惠敏; 沈禹颖

doi:10.13961/j.cnki.stbctb.2015.01.018

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10 a保护性耕作下轮作系统土壤碳氮磷生态化学计量特征

试验研究

- 10 a保护性耕作下轮作系统土壤碳氮磷生态化学计量特征
- Ecological Stoichiometric Characteristics of Soil Carbon, Nitrogen and Phosphorus After 10 Years Conservation Tillage in a Rotation System
- 水土保持通报 2015年35卷第1期页码：96-101
- 作者机构：
  
  兰州大学草地农业科技学院草地农业生态系统国家重点实验室,甘肃,兰州,730020
- 作者简介：
- 基金信息：
  
  甘肃省科技重大专项"庆阳黄土高原生态治理和水资源高效利用的技术体系研究与示范"(1203FKDA035);教育部科学技术研究重大项目(313028);国家自然科学基金项目(31172248)
- DOI：10.13961/j.cnki.stbctb.2015.01.018
  中图分类号：
- 纸质出版：2015
- 稿件说明：
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陆姣云, 王振南, 杨惠敏, 等. 10 a保护性耕作下轮作系统土壤碳氮磷生态化学计量特征[J]. 水土保持通报, 2015,35(1):96-101.

LU Jiaoyun, WANG Zhennan, YANG Huimin, et al. Ecological Stoichiometric Characteristics of Soil Carbon, Nitrogen and Phosphorus After 10 Years Conservation Tillage in a Rotation System[J]. Bulletin of Soiland Water Conservation, 2015, 35(1): 96-101.
陆姣云, 王振南, 杨惠敏, 等. 10 a保护性耕作下轮作系统土壤碳氮磷生态化学计量特征[J]. 水土保持通报, 2015,35(1):96-101. DOI： 10.13961/j.cnki.stbctb.2015.01.018.

LU Jiaoyun, WANG Zhennan, YANG Huimin, et al. Ecological Stoichiometric Characteristics of Soil Carbon, Nitrogen and Phosphorus After 10 Years Conservation Tillage in a Rotation System[J]. Bulletin of Soiland Water Conservation, 2015, 35(1): 96-101. DOI： 10.13961/j.cnki.stbctb.2015.01.018.

摘要

[目的] 研究长期免耕和秸秆覆盖对轮作系统土壤质量的影响规律和机制。[方法] 比较分析了10 a传统耕作、免耕、传统耕作+秸秆覆盖和免耕+秸秆覆盖的玉米-冬小麦-大豆轮作系统0-200 cm内土壤有机碳、全氮、全磷含量及其生态化学计量比变化。[结果] 长期免耕提高土壤表层C和N的含量

仅秸秆覆盖对C和N含量的影响不大;长期保护性耕作对土壤P含量没有显著影响;保护性耕作使N和P最低含量均出现在20-30 cm

而传统耕作则在30-60 cm土层最低;土壤C/N

C/P和N/P均普遍低于10 a前

C/P和N/P的变化量随土层深度增加均呈现出先降低后增高的趋势。[结论] 10 a保护性耕作对C

P的影响均不明显

但4种耕作模式下

土壤C/N

C/P和N/P均普遍低于10 a前。

Abstract

[Objective] To study the effects and mechanisms of long-term no-tillage and straw mulch on soil quality.[Methods] With comparing the soil characteristics from 2001 to 2011

the conventional tillage

no-tillage

conventional tillage + straw mulch and no-tillage + straw mulch were set for 10 years in a corn-wheat-soybean rotation system. Soils of 0-200 cm layers were taken for analyzing organic carbon(C)

total nitrogen(N) and total phosphorus(P).[Results] Long-term no-tillage improved C and N contents of surface soils

and straw mulch only had little effect on them. Long-term conservation tillage had no significant effect on soil P level. Conservation tillage resulted in the lowest N and P contents at 20-30 cm soil layer

while under conventional tillage

it was at 30-60 cm layer. Soil C/N

C/P and N/P were generally lower than that of a decade ago and with soil depth increased

the variation of C/N

C/P and N/P showed a drop-rise trend.[Conclusion] Long-term conservation tillage had no significant effect on soil C

N and P. In the four tillage patterns

soil C/N

C/P and N/P were generally lower than a decade ago.

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references

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