利用方式对红壤水稳定性团聚体形成的影响

本文研究了五种利用方式对红壤水性团聚体形成的影响。结果表明，＞稳定性团聚体含量：林地＞旱地＞荒地＞茶园＞果园。水稳定性团聚体数量以及团聚的水稳定性均与有机质的含量呈正相关。红壤开垦后，有机抽分解加快或补充减少是导致团聚体稳定性下降和水稳定稳定团聚体减少的主要原因。同理，恢复和改良红壤结构性及结构稳定性的关键是增加有机质的投入。

FORMATION OF WATER-STABLE AGGREGATES IN RED SOILS AS AFFECTED BY LAND USE

The distribution and formation of water-stable aggregates in red soils under different land use were studied. The results showed that the contents of >0.25 mm water-stable aggregates increased in the following order: orchard > tea garden > uncropped > upland > woodland. Either the waterstability of aggregates or the content of water-stable aggregates was highly correlated with the contents of soil organic matter. Increased decomposition and decreased input of organic matter after reclamation were responssible for the decrease in both the water-stability of aggregates and the amount of water-stable aggregates in red soils. Therefore, increasing organic matter input is crucial for improving the structure of red soils.