水土保持研究2024，Vol.31Issue(1)：44-52,9.DOI:10.13869/j.cnki.rswc.2024.01.041
渭北旱塬不同年限撂荒地土壤酶活性及其化学计量变化特征
Characteristics of Changes in Soil Enzyme Activities and Stoichiometric Under Different Abandoned Years in the Dry Area of Northern Weihe River Basin
摘要
Abstract
[Objective]This study aims to explore the variations and drivers of soil nutrient and extracellular enzyme activities and their stoichiometric characteristics under the abandoned land in the dry area of Northern Weihe River Basin in order to provide a theoretical basis for the improvement and management of abandoned land in this region.[Methods]Soil nutrients and enzyme activities associated with carbon(C),nitrogen(N),and phosphorus(P)cycles in the lands with different abandoned years(5 years,10 years,20 years,25 years and 33 years)in dry area of Northern Weihe River Basin were measured.Subsequently,The changes and driver factors of them and their stoichiometry were determined by One-way ANOVA,enzyme stoichio-metric model,and principal coordinate analysis(PCoA).[Results]With the increase of abandoned years,the activities of C-acquiring enzymes and N-acquiring enzymes decreased,but the activity of P-acquiring enzymes significantly increased.The changes of soil C,N and P contents showed the opposite trend compared with enzyme activities.Moreover,the C-limitation of soil microorganisms alleviated but P-limitation increased with the increase of abandoned years.Further,the results of PCoA fitting environmental factor analysis showed that soil dissolved organic carbon,total phosphorus,available nitrogen and available phos-phorus were the key factors driving the change of enzyme activity and its econometric ratio.[Conclusion]Abandonment has a significant improvement on soil nutrient,but P-limited will be aggravated with increas-ing of abandoned years(more than 20 years).Therefore,appropriate phosphate fertilizer should be applied to a long-term abandoned land to improve its soil condition.关键词
渭北旱塬/不同撂荒年限/土壤酶活性/生态化学计量Key words
arid area of northern Weihe River Basin/different abandoned years/soil enzymatic activity/eco-logical stoichiometry分类
资源环境引用本文复制引用
雷跻初,刘小伟,邓军,程杰,程积民,郭梁..渭北旱塬不同年限撂荒地土壤酶活性及其化学计量变化特征[J].水土保持研究,2024,31(1):44-52,9.基金项目
国家自然科学基金(41701606) （41701606）
陕西省自然科学基础研究计划(2021JM-093) （2021JM-093）
中央高校基本科研业务费(2452020009)资助 （2452020009）
