The Content of Soil Aggregates in Different Restoration Years of Salted Abandoned Land and the Impact of Stability

doi:10.14088/j.cnki.issn0439-8114.2018.14.006

Abstract

Abstract: Through the field trials of salinized abandoned farmland in the Manas River basin in Xinjiang, the effects of different restoration years of abandoned farmland on the composition and stability of soil aggregate were studied, and the changes of soil aggregate properties under different restoration years of abandoned farmland were evaluated. The results showed that the number of large aggregates（especially>5 mm and 5~2 mm agglomerates） was increased after reclamation of salted abandoned land, and with the increase of planting period after reclamation, the proportion of large aggregates（diameter>0.25 mm） showed decreased first（after 1 year） and then increased trend, and the proportion of micro-aggregates （<0.25 mm） increased first（after 1 year） and then decreased. The agglomerates R_0.25, MWD and GMD decreased in the first year of restoration, and recovered for 5 years, recovered for 10 years and recovered 15 years higher than abandoned farmland, and showed an increased trend with the increase of recovery period. The fractal dimension of soil aggregates showed the opposite trend with the increase of recovery period. The structure and stability of aggregates in salted soils were significantly higher than those in abandoned soils after 5 years of restoration, and showed an increased trend with the increase of recovery period.

Key words: abandoned farmland, aggregates, stability, arid area

CLC Number:

S152.4⁺7

SANG Wen, WANG Wei-chao, YANG Lei, ZHANG Feng-hua. The Content of Soil Aggregates in Different Restoration Years of Salted Abandoned Land and the Impact of Stability[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(14): 27-31.

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