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| 不同改良剂对黄绵土水稳性团聚体的改良效果及其机制 | |
| 引用本文： | 曹丽花,刘合满,赵世伟.不同改良剂对黄绵土水稳性团聚体的改良效果及其机制[J].中国水土保持科学,2011,9(5):37-41. |
| 作者姓名： | 曹丽花 刘合满 赵世伟 |
| 作者单位： | 1. 西北农林科技大学 黄土高原土壤侵蚀与旱地农业国家重点实验室 712100 陕西杨凌;西藏农牧学院资源与环境学院 860000 西藏林芝 2. 西藏农牧学院资源与环境学院 860000 西藏林芝 3. 西北农林科技大学 黄土高原土壤侵蚀与旱地农业国家重点实验室 712100 陕西杨凌 |
| 基金项目： | 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室基金“退化草地碳动态及温湿度效应”(10501-249) |
| 摘 要： | 通过室内土柱培养,采用聚丙烯酰胺(Polyacrylamide,PAM)、沃特保水剂、β-环糊精、腐殖酸等4种土壤结构改良剂对黄绵土水稳性团聚体进行改良。结果表明:4种改良剂均可促进>0.25 mm水稳性团聚体的形成,在浓度0.05%～0.40%范围内,其改良效果表现为PAM>β-环糊精>沃特保水剂>腐殖酸,且黄绵土团聚体分形维数显著降低,尤以PAM改良效果最明显;在低浓度条件下,4种改良剂均可有效地降低土壤密度;土壤粒径分布表明,PAM改良黄绵土水稳性团聚体的机制是使<1 mm粒径的团聚体团聚为更大的团聚体,尤其是团聚为>5 mm的团聚体,PAM在4种改良剂中对黄绵土改良效果最好。阐明不同改良剂对黄绵土水稳性团聚体的改良效果及机制,可为合理利用改良剂改良土壤结构提供理论依据。 |
| 关 键 词： | 土壤改良剂 水稳性团聚体 分形维数 土壤密度 |
Effect of soil conditioners on water stability of soil aggregates and its mechanisms in loessal soil |
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| Cao Lihua,Liu Heman,Zhao Shiwei.Effect of soil conditioners on water stability of soil aggregates and its mechanisms in loessal soil[J].Science of Soil and Water Conservation,2011,9(5):37-41. | |
| Authors: | Cao Lihua Liu Heman Zhao Shiwei |
| Affiliation: | Cao Lihua1,2,Liu Heman2,Zhao Shiwei1(1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,712100,Yangling,Shaanxi,2.Department of Resources and Environment,Tibet Agricultural and Animal Husbandry College,860000,Linzhi,Tibet:China) |
| Abstract: | Soil conditioners,which are widely used in preventing soil and water losses,could improve soil physical structure and provide good conditions for plant growth.PAM,water super absorbent polymer,β-cyclodextrin and humic acid were used as soil conditioners in this paper.The results showed that all of the four conditioners could promote the formation of 0.25 mm water-stable aggregates.Within the test range of 0.05%-0.40%,the improved effect showed PAMβ-cyclodextrin water super absorbent polymer humic acid,and the fractal dimension of aggregates decreased largely,especially for the PAM.All of the four conditioners could reduce the soil bulk density at the low concentration.From soil particle size distribution,it can be observed that 1 mm soil water-stable aggregates could form to 1 mm soil water-stable aggregates,especially 5 mm soil water-stable aggregates obviously,which will explain how PAM worked on soil structure.In the four conditioners,PAM played the best role in improving loessal soil structure.This paper discovered the effect and mechanism of soil conditioners on loessal soil,which will provide theoretic basis of using and improving soil conditioners reasonably. |
| Keywords: | soil structural modifiers water-stable aggregates fractal dimension bulk density |
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