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黄土高原旱地不同种植系统对土壤 水稳性团聚体及碳氮分布的影响
魏艳春1; 马天娥1; 魏孝荣1,2; 王昌钊3; 郝明德1
Source Publication农 业 环 境 科 学 学 报

以黄土高原连续进行了 27 年的长期定位试验为对象,研究了粮-草长周期轮作、粮-豆短周期轮作、玉米连作和小麦连作
土壤中<0.053 mm 团聚体含量最高,占土壤质量的 35%;长周期轮作系统 0~20 cm 和 20~40 cm 土层土壤 0.25~2 mm 团聚体含量高
于玉米连作、小麦连作和短周期轮作系统,而<0.053 mm 团聚体含量低于这 3 种轮作系统,且长周期轮作系统土壤团聚体的平均重
量直径和几何平均直径也较高。种植系统对团聚体有机碳和全氮分布的影响主要体现在 0~20 cm 土层土壤,长周期轮作系统土壤
中>2 mm 和 0.25~2 mm 团聚体有机碳含量显著高于其他种植系统,<0.25 mm 团聚体有机碳含量与其他种植系统差异不显著。长周
量呈极显著正相关关系。土壤有机碳和全氮含量的变化主要取决于 0.25~2 mm 和 0.053~0.25 mm 团聚体有机碳和全氮的变化,而

Other Abstract

In this paper, we examined the distribution of water stable aggregates and organic carbon(OC)and nitrogen(N)in soils under
different cropping systems, using a 27-year field experiment in the Loess Plateau. The relationships between OC and N contents in bulk soil
and aggregates were also analyzed. Results showed that <0.053 mm aggregates, accounting for 35%, dominated the soil mass in 0~20 and
20~40 cm soil layers in the semiarid farmland of the Loess Plateau. The percentage of 0.25~2 mm aggregates was higher, but that of <0.053
mm aggregates was lower in the grass-grain rotation system than the other cropping systems. In the grass-grain rotation system, mean weight
diameter and geometrical mean diameter of soil aggregates were also greater. The significant effects of cropping system on OC and N associ-
ated with aggregates mainly occurred in 0~20 cm layer. The OC content in >2 mm and 0.25~2 mm aggregates was significantly higher in
grass-grain rotation system than in the other systems, while OC content in 0.053~0.25 mm and <0.053 mm aggregates did not differ among  different cropping systems. The grass-grain system showed higher N content and lower C/N ratio in each aggregate compared with other sys-
tems. The OC and N content in bulk soils was positively correlated with OC and N content associated with aggregates. These results suggest
that the responses of OC and N in the bulk soil to cropping systems mainly depend on OC and N associated with 0.25~2 mm and 0.053~
0.25 mm aggregates. Additionally, grass-grain rotation system has greater potential to improve soil structure and increase the content of OC
and N associated with aggregates. 

Keyword黄土高原 旱作农田 种植系统 水稳性团聚体 有机碳 全氮
Indexed By中文核心期刊要目总览
Document Type期刊论文
Affiliation1.西北农林科技大学资源环境学院,陕西 杨凌 712100
2.西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕 西 杨凌 712100
3.陕西出入境检验检疫局技术中心,西安 710068
Recommended Citation
GB/T 7714
魏艳春,马天娥,魏孝荣,等. 黄土高原旱地不同种植系统对土壤 水稳性团聚体及碳氮分布的影响[J]. 农 业 环 境 科 学 学 报,2016,35(2):305-313.
APA 魏艳春,马天娥,魏孝荣,王昌钊,&郝明德.(2016).黄土高原旱地不同种植系统对土壤 水稳性团聚体及碳氮分布的影响.农 业 环 境 科 学 学 报,35(2),305-313.
MLA 魏艳春,et al."黄土高原旱地不同种植系统对土壤 水稳性团聚体及碳氮分布的影响".农 业 环 境 科 学 学 报 35.2(2016):305-313.
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