Effect of sod cutting techniques on soil and vegetation restoration of degraded Kobresia pygmaea alpine meadows
[Objective]To determine the effects of different sod cutting techniques on soil physico-chemical properties and above-ground productivity recovery of plant communities in Kobresia pygmaea al-pine meadows.[Method]Using total soil nutrients(total carbon,total nitrogen,inorganic carbon),available soil nutrients(available phosphorus,available potassium,ammonium nitrogen),soil moisture,soil compact-ness and numerical characteristics of the plant community as indicators,the restoration effects on the degra-dation of alpine K.pygmaea were evaluated using the restoration measures of sod cutting(C1),sod cut-ting+reseeding(C2),sod cutting + fertilization(C3)and sod cutting + reseeding + fertilization(C4).[Result]Soil moisture of C1,C2,C3 and C4 treatments was 0.09%,4.80%,3.58%and 4.05%higher than the control treatment(CK),and the concentrations of soil carbon(C),nitrogen(N),phosphorus(P)and potassium(K)were also significantly increased compared to CK(P<0.05).Soil total C and N concentra-tions were significantly influenced by soil depth,treatments and their interactions based on two-way ANOVA analysis(P<0.01).Different treatments had different effects on the increase of plant community characteristics and seed emergence(P<0.01),among which the density of the plant community in C3 was increased by 68.77 plants/m2 compared to CK(P<0.05).The population of dicotyledonous plants was sig-nificantly negatively correlated with soil inorganic C(P<0.01)with a correlation coefficient of-0.37.The capacity of C2,C3 and C4 in restoring the degraded meadows was higher than that of C1 by comprehensively assessing the restoration effects of soil physical and chemical properties using the standardized multidimen-sional data analysis.[Conclusion]Sod cutting with exogenous seed bank and exogenous nutrient addition can improve the productivity and soil limited nutrient content of degraded Kobresia pygmaea meadow in a short period of time,and these methods have a certain application prospect in ecological restoration practic.
NETL
NSTL
万方数据
维普
