Effects of biological soil crusts on plant growth and nutrient dynamics in the Minqin oasis-desert ecotone,Northwest China  

作　　者：KANG Jianjun YANG Fan ZHANG Dongmei DING Liang 

机构地区：[1]Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Linze Inland River Basin Research Station,Chinese Ecosystem Research Network,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]Minqin National Studies Station for Desert Steppe Ecosystem,Gansu Desert Control Research Institute,Lanzhou 730070,China [3]Zhangye Agricultural and Rural Bureau,Zhangye 734000,China

出　　处：《Journal of Arid Land》2025年第1期130-143,共14页干旱区科学(英文版)

基　　金：supported by the Natural Science Foundation of Gansu Province,China(24JRRA733,23JRRA589);the National Natural Science Foundation of China(42377470,42207539);the Light of Western Light Program of Talent Cultivation of Chinese Academy of Sciences(22JR9KA028).

摘　　要：Biological soil crusts(BSCs)play crucial roles in improving soil fertility and promoting plants settlement and reproduction in arid areas.However,the specific effects of BSCs on growth status and nutrient accumulation of plants are still unclear in different arid areas.This study analyzed the effects of three different BSCs treatments(without crust(WC),intact crust(IC),and broken crust(BC))on the growth,inorganic nutrient absorption,and organic solute synthesis of three typical desert plants(Grubovia dasyphylla(Fisch.&C.A.Mey.)Freitag&G.Kadereit,Nitraria tangutorum Bobrov,and Caragana koraiensis Kom.)in the Minqin desert-oasis ecotone of Northwest China.Results showed that the effects of three BSCs treatments on seed emergence and survival of three plants varied with seed types.The IC treatment significantly hindered the emergence and survival of seeds,while the BC treatment was more conducive to seed emergence and survival of plants.BSCs significantly promoted the growth of three plants,but their effects on plant growth varied at different stages of the growth.Briefly,the growth of G.dasyphylla was affected by BSCs in early stage,but the effects on the growth of G.dasyphylla significantly weakened in the middle and late stages.However,the growth of N.tangutorum and C.koraiensis only showed differences at the middle and late stages,with a significant enhancement in growth.Analysis of variance showed that BSCs,plant species,growth period,and their interactions had significant effects on the biomass and root:shoot ratio of three plants.BSC significantly affected the nutrients absorption and organic solute synthesis in plants.Specifically,BSCs significantly promoted nitrogen(N)absorption in plants and increased plant adaptability in N poor desert ecosystems,but had no significant effects on phosphorus(P)absorption.The effects of BSCs on inorganic nutrient absorption and organic solute synthesis in plants varied significantly among different plant species.The results suggest that BSCs have significant effects on the

关 键 词：biological soil crusts(BSCs) desert oasis desert plants GROWTH nutrient accumulation 

分 类 号：Q948[生物学—植物学]