不同种群裸果木与土壤化学计量学特征沿经度梯度变化的研究

Longitude gradient changes on plant community and soil stoichiometry characteristics of gymnocarpos przewalskii in different populations

以12个不同经度(从低到高依次为94°16′、94°46′、95°28′、95°58′、96°22′、98°0′、98°54′、99°26′、99°46′、102°26′、103°09′、105°03′)梯度内的野外观测和土壤实测数据,分析了不同种群裸果木与土壤有机质、氮、磷的化学计量特征沿经度梯度变化规律。结果表明,裸果木叶C、P含量(319.15~493.98mg·g-1,0.55~1.36mg·g^(-1))随着经度的增加而显著升高,裸果木叶N含量(5.41~32.71mg·g^(-1))随经度的升高而显著降低,土壤C、N、P含量及碱解氮均随经度的升高而增加,土壤pH、速效磷以及速效钾随经度的增加而降低。裸果木叶片元素除C含量、C:N与土壤含水量之间显著正相关,与其他土壤养分含量均无显著相关关系。

Based on the field observations and soil measured data in 12 different longitude gradients(From low to high in turn is 94°16′、94°46′、95°28′、95°58′、96°22′、98°0′、98°54′、99°26′、99°46′、102°26′、103°09′、105°03′).In this research,we studied the stoichiometry characteristics of Different populations Gymnocarpos przewalskii and soil organic matter,nitrogen and phosphorus along the longitude gradient.The results showed as follow:The contents of C and P(319.15~493.98 mg·g-1,0.55~1.36 mg·g-1)in the leaves of the Gymnocarpos przewalskii increased significantly with the increase of the longitude,The N content of Gymnocarpos przewalskii leaves decreased significantly with the increase of longitude,The content of soil C,N,P and alkali nitrogen increased with the increase of longitude,,Soil pH,available phosphorus and available potassium decreased with the increase of longitude.There was a significant positive correlation between The contents of C 、C:N and soil water content,And no significant correlation with other soil nutrient contents.