Soil Aggregates Stability at Different Sieving Strength for Typical Soils in Karst Region of Northwest Guangxi Province

HU Le-ning; SU Yi-rong; HE Xun-yang

doi:10.13961/j.cnki.stbctb.2014.03.047

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Soil Aggregates Stability at Different Sieving Strength for Typical Soils in Karst Region of Northwest Guangxi Province

- Soil Aggregates Stability at Different Sieving Strength for Typical Soils in Karst Region of Northwest Guangxi Province
- Bulletin of Soiland Water Conservation Vol. 33, Issue 3, Pages: 236-241(2014)
- 作者机构：
  
  1. 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,湖南,长沙,410125
  2. 中国科学院环江喀斯特农业生态试验站, 广西环江,547100
  3. 广西师范大学环境与资源学院,广西,桂林,541004
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.03.047
  CLC：
- Published：2014
- 稿件说明：
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HU Le-ning, SU Yi-rong, HE Xun-yang. Soil Aggregates Stability at Different Sieving Strength for Typical Soils in Karst Region of Northwest Guangxi Province[J]. Bulletin of Soiland Water Conservation, 2014, 33(3): 236-241.
DOI：

HU Le-ning, SU Yi-rong, HE Xun-yang. Soil Aggregates Stability at Different Sieving Strength for Typical Soils in Karst Region of Northwest Guangxi Province[J]. Bulletin of Soiland Water Conservation, 2014, 33(3): 236-241. DOI： 10.13961/j.cnki.stbctb.2014.03.047.

摘要

采用AS 200筛分仪分析了不同有机碳含量下3种喀斯特典型土壤(红壤、棕色石灰土、黑色石灰土)的团聚体颗粒在不同筛分强度(1.5

2和2.5 mm振幅)的分级特征。结果显示

3种土壤平均重量直径(MWD)从大到小为:黑色石灰土>棕色石灰土>红壤(p<0.05)。随筛分强度由小到大

棕色石灰土和黑色石灰土的团聚体颗粒分级变化较小

红壤团聚体颗粒分级由大颗粒(>8

8~5

5~2 mm)团聚体为主逐渐变为中间粒径颗粒(5~2

2~1 mm)。红壤团聚体结构最易被筛分过程破坏

其次是棕色石灰土

最后是黑色石灰土。研究表明石灰土团聚体机械稳定性强于红壤

且筛分强度直接影响团聚体分级结果。从团聚体聚合角度来看

喀斯特石灰土土壤稳定性较强。

Abstract

Soil aggregates of two karst soils(terra fusca and rendzina) and one zonal soil(red soil) with different soil organic carbon(SOC) contents were analyzed at 1.5

2 and 2.5 mm sieving strength using AS200. Results show that the three soils

in order of decreasing mean soil weight diameter(MWD)

were rendzina

terra fusca and red soil(p<0.05). With the change of sieving strength

particle size fractions of soil aggregates for terra fusca and rendzina were the same

while for red soil

the fraction changed from the dominance by large aggregates(>8

8~5 and 5~2 mm) to middle sizes(5~2 and 2~1 mm). Red soil was the most easily destroyed soil

terra fusca was the second

and rendzina was the third

according to the mechanical classification. This implies that the mechanical stability of karst soil aggregates was better than that of red soil

and soil aggregate classification for the karst soils was directly affected by sieving strength. From the point of view of soil aggregates

the stability of the karst soils was stronger.

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