耕作方式对苜蓿（Medicago sativa）地土壤团粒的影响

doi:10.7522/j.issn.1000-694X.2013.00329

摘要/Abstract

摘要： 以甘肃干旱区连作5年和轮作1年的苜蓿（Medicago sativa）地土壤为研究对象，对不同耕作方式下土壤团粒结构、容重、含水量指标进行研究。结果表明：在轮作和连作模式下，随着土壤深度的增加，>0.25 mm土壤团粒质量在干筛和湿筛处理下均降低，>0.25 mm团粒累积质量越大，分形维数越小。在浸水条件下，粒径为0.5~0.25 mm 的土壤团聚体含量最高，其它粒径团聚体含量依粒径的增大而降低。轮作土壤含水量呈现先增加后降低、最后再增加的变化过程；0~60 cm土层水分含量最高（13.881%），60~80 cm土层含水量下降到较低值（10.343%），80~100 cm土层水分迅速恢复（13.811%）。连作和轮作土壤容重随土壤深度均呈现依次增大变化，连作最大值为1.425%比最小值高出17.6%，轮作最大值1.432%比最小值高出18.7%。

关键词: 干旱区, 分形维数, 含水量, 容重, 轮作, 连作, 苜蓿（Medicago sativa）

Abstract: By researching alfalfa soil with five years monocropping and one year rotation in arid area of Gansu, China, the study presented the soil aggregate structure, bulk density, water content under different cropping systems. It indicated that in both systems, the aggregate structure exceeding 0.25 mm under dry sieve and wet sieve treatments tended to decline in descending soil layers and the lager aggregate structures were found with smaller fractal dimensions. With wet sieve, the 0.5~0.25 mm granules were with the highest soil aggregate. In rotation, the water content was at its highest level (13.881%) at the 0~60 cm soil, and dropped to a relatively low level (10.343%) at the 60~80 cm soil, then quickly recovered to (13.811%) at 80~100 cm. The maximum of bulk density was 1.425%, 17.6% higher than the minimum in monocroping, while in rotation cropping, the maximum was 1.432%, 18.7% higher than the minimum.

Key words: arid area, fractal dimension, water content, bulk density, rotation cropping, monocropping, alfalfa

中图分类号:

S152.3

崔星, 师尚礼. 耕作方式对苜蓿（Medicago sativa）地土壤团粒的影响[J]. 中国沙漠, 2014, 34(2): 385-390.

Cui Xing, Shi Shangli. Effects of Cropping Patterns on Soil Aggregates of Alfalfa Field[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(2): 385-390.

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