西北林学院学报2025，Vol.40Issue(2)：73-83,11.DOI:10.3969/j.issn.1001-7461.2025.02.08
平茬对中国沙棘早衰人工林营养元素含量及其生态化学计量比的影响
Effects of Coppicing on Nutrient Contents and Their Ecological Stoichiometric Ratios in Premature Aging Plantation of Hippophae rhamnoides ssp.sinensis
摘要
Abstract
Coppicing is one of the common ways to promote the regeneration of forest sprouts.Our aim was to understand the effects of coppicing on the nutritional status of premature senescent Hippophae rham-noides ssp.sinensis plantations and the optimal stumping height.We analyzed the contents of C,N,P,K and their ecological stoichiometric ratios in leaves,branches,trunks,vertical roots and horizontal roots at different stubble heights(control,0,10,and 20 cm).The results showed that 1)the content of C,N,P and K increased with the increase of stubble height,and showed a trend of increasing first and then decreasing with the increase of stubble height,especially the content in leaves,vertical roots and horizontal roots.2)The variation degree of C,N,P and K contents changed by coppicing,and the coefficient of variation in-creased from 0.97％-9.75％(control)to 0.63％-19.56％(coppicing),especially when the stubble height was 10 cm,the variation degrees of leaf,vertical root and horizontal root nutrient content were the largest.3)C:N and C:K showed significant differences in stubble height and different modules(P＜0.05),and C∶P,N∶P,N∶K and P∶K showed extremely significant differences in different modules(P＜0.01).According to the ecological stoichiometric ratio,coppicing increased the absorption capacity of N,P and K in H.rhamnoides ssp.sinensis and accelerated the accumulation of C.4)There was a synergis-tic effect between the contents of C,N,P and K,and there was a trade-off relationship between their stoi-chiometric ratios.Principal component analysis could not completely separate the contents of nutrient ele-ments and their stoichiometric ratios in different stubble height treatments.It is concluded that the com-prehensive nutritional status of H.rhamnoides ssp.sinensis after coppicing is affected by both element content and stoichiometric ratio,and the effect of stubble height 10 cm is the best.关键词
平茬高度/营养元素/生态化学计量比/中国沙棘Key words
stubble height/nutrient element/ecological stoichiometry/Hippophae rhamnoides ssp.sinensis分类
农业科技引用本文复制引用
白双成,聂恺宏,李仲牧,贺斌,姚增玉,李根前..平茬对中国沙棘早衰人工林营养元素含量及其生态化学计量比的影响[J].西北林学院学报,2025,40(2):73-83,11.基金项目
国家自然科学基金(30371193,31070551,31570609). （30371193,31070551,31570609）
