新垦赤红壤结构特性的演化
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* 国家自然科学基金


CHANGES OF STRUCTURAL CHARACTERISTICS OF NEWLY CULTIVATED LATERITIC RED SOIL
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    摘要:

    本文探讨新垦赤红均结构特性的变化,定位试验结果表明:(1)在亚热带生物气候条件下垦殖赤红壤,由于耕作管理扰动土壤,将不可避免地产生土壤砂化或粉砂化现象。(2)新垦赤红壤在利用过程中,水稳性团聚体不断发生变化,较大粒径团聚体增多,较小粒径部分减少。(3)新垦赤红壤团聚体增加的原因,对豆科与非豆科作物轮作土壤来说,主要是土壤有机质含量有了提高;对多年生台湾草土壤来说,主要是植物根系的穿插作用。(4)作物轮作式土壤的容重、孔隙都有所改善,更有利于作物生长;多年生台湾草式的土壤孔隙度则有所减少。

    Abstract:

    This paper primarily discusses the changes of structural characteristics of newly cultivated lateritic red soil. Results are summarized as follows: (1)Under subtropical bioclimate condition, it was unavoidable for newly cultivated lateritic red soil to be sandified due to distrubance by tillage and other managemen practice. It was found that aftrr cultivation, the contents of <0.001mm clay and <0.01mm physical clay in newly cultivated red soil reduced by 35-72% and 10-20% respectively, 0.05-0.01mm silt increased by 20-55%,while 3-0.05mm sand increased or decreased with the changes of silt content.(2) Waterstable aggregate composition of the lateritic red soil changed after cultivation.>1mm aggregates increased more than one time over before cultivation, while <0.5mm aggregates decreased by 3-25%.The increase of>1mm aggregates in 0-20cm soil layer under different patterns of crop rotation was in the descending sequence of perenial Taiwan grass >1:1>1:2>2:1 (3) Reasons for increase of larger aggregates were different for soils under different use patterns. For soils with legume and non-legume crop rotation the increase of larger aggregates might be attributed to the increase of organic matter, while for soil grown with perenial Taiwan grass it might be due to the grass root peneratration and cutting, It was indicated that the more the soil organic matter, the more the >1mm aggregates would be in the soil with legume and non-legume crop rotauon.(4) The bulk density and porosity in the soils with legume and non-legume crop rotation gradually became more suitable for the growth of crops. Generally, the bulk density and capillary porosity rose in the 0-10cm soil layer but decreased in the 10-20cm layer. But no increase in bulk density and porosity was found in the soil grown with perenial Taiwan grass.

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唐淑英,钟继洪,杨兴邦,谭军.新垦赤红壤结构特性的演化[J].土壤学报,1995,32(3):253-265. Tang Shuying, Zhong Jihong, Yang Xingbang, Tan Jun. CHANGES OF STRUCTURAL CHARACTERISTICS OF NEWLY CULTIVATED LATERITIC RED SOIL[J]. Acta Pedologica Sinica,1995,32(3):253-265.

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  • 在线发布日期: 2013-02-25
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