The distribution and availability of phosphorus fractions in restored cut slopes soil aggregates:a case study of subalpine road,Southwest China  

作　　者：Mengke Zhu Bocong Huang Shenghao Ai Zongyang Liu Xiaoyan Ai Meihua Sheng Yingwei Ai 

机构地区：[1]Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education,College of Life Sciences,State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China [2]Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第4期27-39,共13页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.41971056);the National Key R&D Program of China(No.2017YFC0504903)。

摘　　要：The distribution and availability of phosphorus(P)fractions in restored cut slope soil aggregates,along altitude gradients,were analyzed.Samples were collected at 3009,3347,3654 and 3980 m of altitude.We examined soil aggregates total phosphorus(TP),available phosphorus(AP)and phosphorus activation coefficient(PAC),and discovered that there was no significant difference in TP levels between all four altitudes samples(p>0.05).However,there was a significant difference in AP at 3009,3347 and 3980 m of altitude(p<0.05).At the altitudes of 3009,3347 and 3654 m,the AP accumulation in small size aggregates was more advantageous.Overall,PAC dropped steadily as soil aggregates sizes increased,as shown:PAC(3654 m)>PAC(3347 m)>PAC(3009 m)>PAC(3980 m).In all particle size soil aggregates,the distribution of the P fractions was as follows:total inorganic phosphorus(TPi)>total organic phosphorus(TPo)>residual phosphorus(R-P),at 3009,3347 and 3654 m,but a different registry was observed at 3980 m of altitude:TPo>TPi>R-P.Through correlation and multiple stepwise regression analysis,it was concluded that active NaHCO_(3)-Pi was the main AP source.It was also suggested that more attention should be given to the ratio of small particle size aggregates to increase soil AP storage.In order to improve the activation capacity and supply of soil P,along with promotion of the healthy development of soil ecosystem on slope land,it was suggest that inorganic P fertilizer and P activator could be added to soil at both low(3009 m)and high altitudes(3980 m).

关 键 词：Altitude gradient Restored cut slopes Soil aggregates Phosphorus fraction Available phosphorus 

分 类 号：S15[农业科学—土壤学]