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以北川擂鼓镇凤凰山震后滑坡体表层土壤为研究对象,结合网格取样和室内分析运用地统计学和经典统计学方法对其养分空间变化进行分析.结果表明:研究区土壤有效磷(AP)属高变异强度,其他养分均属中变异强度.AP和土壤有机碳(SOC)的块基比分别为27.9%和28.8%表现为中等空间相关性;土壤全氮(TN)、全磷(TP)、全钾(TK)、水解性氮(AN)和速效钾(AK)的块基比分别为20.0%、24.3%、11.1%、11.2%和22.7%均表现为强烈的空间相关性.土壤TP的变程最大,为1232.7 m;其次为AN(541.27 m)、TN(468.35 m)、TK(136.0 m)、AK(128.7 m)、AP(116.6 m)、SOC(93.5 m).备土壤养分随海拔的变化规律不明显,而从滑坡区、过渡区至未破坏区则呈明显增加趋势.其中,滑坡区表层土壤TP含量较未破坏区减少10.3%,减幅最小,而AP减幅最大,达79.7%;过渡区备养分含量占未破坏区的31.1%~87.2%脾幅最小和最大的仍为TP和AP.地震滑坡扰动是导致土壤养分空间变化的主要原因.
Taking the landslide body surface of Fenghuangshan earthquake after beijiang leigu town in Beichuan as the research object, the spatial variation of nutrient in the landslide body was analyzed by using the geodetic and classical statistical methods combined with grid sampling and indoor analysis.The results showed that: AP) were highly variable and all other nutrients were mid-intensity.The soil-organic ratio (SOC) of AP and soil SOC were 27.9% and 28.8%, respectively, showing medium-spatial correlation. Soil total nitrogen (TN), total phosphorus (TP), total potassium (TK), hydrolyzable nitrogen (AN) and available potassium (AK) were 20.0%, 24.3%, 11.1%, 11.2% and 22.7% respectively, which showed strong spatial correlation The TP of soil was the largest, which was 1232.7 m, followed by AN (541.27 m), TN (468.35 m), TK (136.0 m), AK (128.7 m), AP (116.6 m) and SOC (93.5 m). The nutrient content of prepared soil did not change obviously with altitude, but from landslide area to transitional area to non-damaged area, the content of TP increased obviously, in which, TP content of surface soil in landslide area decreased 10.3% The maximum and the maximum decrease were 79.7%. The minimum and maximum amplitude of spleen amplitude of 31.1% ~ 87.2% of the unbroken areas were still TP and AP, Caused mainly due to soil nutrient spatial variation.