PLA沙障对土壤硬度的影响

 为了解新材料聚酯纤维(PLA)沙障对沙丘土壤硬度的影响,通过测定铺设PLA沙障沙丘表层的土壤硬度,并以铺设麦草沙障沙丘及裸沙丘为对照,对比研究各种规格、迎风坡、坡顶及背风坡土壤硬度的差异。结果表明:铺设PLA沙障沙丘表层土壤硬度显著高于麦草沙障沙丘(P<0.001),且2者土壤硬度均显著高于未铺设沙障的裸沙丘(P<0.001);2 m×2 m和1 m×1 m PLA沙障土壤硬度比较接近,均显著小于3 m×3m规格的(P<0.01),而麦草沙障3种规格的土壤硬度差异较小;2种沙障所在沙丘不同部位土壤硬度变化趋势相似,均是迎风坡的最大,坡顶次之,背风坡的最小;PLA沙障及麦草沙障单个障格内的土壤硬度分布都是不均匀的,并且二者的土壤硬度分布规律存在差异。

Effects of Poly Lactic Acid sand barrier on soil hardness

In order to known the effect of Poly Lactic Acid（PLA） sand barrier on soil hardness,the topsoil hardness of PLA sand barrier dunes,traditional straw sand barrier dunes and bare dunes were investigated,and the topsoil hardness on windward slope,slope top and lee slope were compared between PLA sand barrier and straw sand barrier dunes.The results showed that： the topsoil hardness of PLA barrier dunes was significantly higher than straw barrier ones（P〈0.001）,and both were significantly higher than the unpaved ones（P〈0.001）;The topsoil hardness of 2 m×2 m and 1 m×1 m PLA sand barrier were near and significantly smaller than the 3 m×3 m ones（P〈0.01）,while that of three kinds of straw sand barriers had no differences;The topsoil hardness of two kinds of sand barrier dunes in different parts had a similar trend,soil hardness of the windward slope was the largest,that of slope top was the second and that of lee slope was the minimum;Top soil hardness in single barrier grid of the PLA sand barriers and straw sand barriers was uneven distribution.