本文關(guān)鍵詞： 微團聚體 PAM 根系特征 根長密度 根表面積密度　出處：《草業(yè)學(xué)報》2017年12期 　論文類型：期刊論文

【摘要】：為探討PAM(聚丙烯酰胺)和草類根系對侵蝕劣地土壤的改良效果,試驗以該環(huán)境的紫色土為研究對象,設(shè)置了空白對照(CK)以及單施PAM、單植草類、"狗牙根+PAM"、"三葉草+PAM"4個試驗處理類別,6個月后測定了土壤微團聚體組成,分析了土壤微團聚體分布、結(jié)構(gòu)及分形特征。結(jié)果表明,1)各試驗處理的大粒徑微團聚體含量增加,小粒徑的則減少;2)各試驗處理的MWSSA(平均重量比表面積)、分散系數(shù)和分散率均顯著減小(各指標(biāo)最小值分別為CK的0.30、0.15和0.60倍),MWD(平均重量直徑)、團聚狀況和團聚度均顯著增大(各指標(biāo)最大值分別為CK的1.17、1.49和1.28倍);3)各試驗處理的微團聚體分形維數(shù)均減小;4)GY-PAM1(狗牙根+液施PAM,濃度:30 g/m~3)土壤的各項微團聚體結(jié)構(gòu)指標(biāo)均優(yōu)于其他試驗處理,表現(xiàn)出較好的抗侵蝕性;5)"草類+PAM"的根系指標(biāo)均優(yōu)于單植草類,平均根長密度(RLD)和d(直徑)≤0.2 mm徑級分別是影響該紫色土結(jié)構(gòu)穩(wěn)定性和抗侵蝕性的主要因子和關(guān)鍵徑級。
[Abstract]:In order to study the effect of PAM and grass root system on soil improvement of eroded soil, the purple soil in this environment was used as the research object, the blank CK was set up and PAM was applied only. The composition of soil microaggregates was determined and the distribution of soil microaggregates was analyzed after 6 months in four experimental treatments of monophyllodes, "PAM" and "PAM". Structure and fractal characteristics. The results show that the content of large particle size microaggregate increased and the small particle size decreased in each experiment. 2) the MWSSAs (average weight specific surface area, dispersion coefficient and dispersion rate) of each treatment decreased significantly (the minimum values of each index were 0.300.15 and 0.60 times of CK, respectively). MWD (mean weight diameter), agglomeration status and agglomeration degree increased significantly (the maximum values of each index were 1.17 ~ 1.49 and 1.28 times of CK, respectively); 3) the fractal dimension of microaggregates decreased in each experiment. (4) the soil microaggregate structure indexes of GY-PAM1 (concentration of 30 g / m ~ (-3)) were better than those of other experimental treatments, and showed better corrosion resistance. 5) the root system index of "grass PAM" was better than that of single plant grass. The mean root length density (RLDD) and d (diameter) 鈮，

本文編號：1473357