摘要
土壤扰动是引起土壤侵蚀主要原因之一，土壤侵蚀常常导致土壤质量下降和退化。应用聚丙烯酰胺（PAM）控制土壤封闭和减少侵蚀已有过许多研究，然而很少有研究关注最有效的PAM分子量和电荷密度。，应用喷射工艺，研究不同特性参数的PAM对坡面扰动土壤水分物性调控的影响。结果表明，PAM对土壤物性的调控作用显著，土壤客重的降低、土壤孔隙度和土壤持水量的提高以分子量为10mg,／mol的PAM为最优．同一分子量不同水解度调控效果有显著差别（F=9．44^＊＊）。对于土壤中〉0.25mm水稳性团粒结构的调控效果以分子量为10～12mg／mol的PAM最为明显。相同分子量不同水解度的PAM对土壤水稳性团粒的影响差异性大．其中以水解度为30％作用效果最好。与PAM用于缓坡土壤改良相比，对于陡坡的扰动土壤，采用PAM进行改良仍然能够得到满意的效果。
Disturbed soil is a main cause for soil erosion that often leads to decreased soil quality and soil degradation. Much research has been conducted using PAM （polyacrylamide） to control soil sealing and reduce erosion, but few studies have attempted to determine the most effective molecular weight and charge density of PAM. In the present study, spraying techniques were employed to study the effects on soil hydro-physical properties by PAM differing in molecular weight and hydrolysis degree under steep slope conditions. The resuhs showed that PAM significantly amended the hydro - physical properties of the soil, lowering its bulk density, improving its porosity and raising its water-holding capacity. A molecular weight of 10 mg/mol appeared to be optimal for soil improvement. Marked differences were noticed among treatments of PAM with different hydrolysis degree for soil amelioration （ F = 9.44 ^＊ ＊ ）. PAM with a molecular weight ranging from 10 to 12 mg/mol performed most effectively to improve percent water stable aggregation. A hydrolysis degree of 30% gave the most satisfactory results. Compared with a previous study on a moderate slope, the results of improving soil on a steep slope with PAM was satisfactory.
出处
《西南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第3期381-385,共5页
Journal of Southwest Agricultural University
基金
国家重点基础研究发展计划资助项目(2003CB415100)
关键词
PAM
特性参数
喷射工艺
土壤物性
PAM （polyacrylamide）
characteristic parameter
spraying technology
soil hydro-physical properties
