不同树龄库尔勒香梨园土壤有机碳储量及其对树体生长的影响

[目的]调查库尔勒香梨园土壤有机碳存储情况及不同林龄果林的碳储量差异,检定土壤理化性质及其与果树生长参数之间的相关性,追踪分析土壤有机碳的沉积过程及其对果树的影响.[方法]以新疆巴音郭楞州(以下简称巴州)沙依东园艺场不同树龄库尔勒香梨果园为调查地,分层取样并测定土壤有机碳等理化指标和树高、胸径、冠幅、株距等主要果树生长参数.通过方差分析法(S -N -K&Duncan,P=0.05)和相关分析法( Spearman,P=0.05)分析不同树龄库尔勒香梨园土壤有机碳储量差异及其对树体生长的影响.[结果]成熟林和过熟林土壤有机碳储量远高于幼龄林；土壤有机碳与冠幅和株距之间呈显著正相关；土壤含水量与胸径和冠幅之间呈显著负相关.[结论]香梨园土壤有机碳储量随树龄增加而沉积增多并对树体生长产生影响,经济林建设可能对农业生态系统服务功能的改善发挥重要作用.

Soil Organic Carbon Aggradation of Different Stand Age Orchards and Its Effect on Growth of Korla Fragrant Pear

【Objective】The purpose of this project was to investigate soil organic carbon storage in Korla fragrant pear orchard and the differences in different age orchards and detect the correlation between soil physicochemical properties and fruiter growth parameters followed by analysis of soil organic carbon settlement and accumulation process,and its effects on trees.【Method】This research ttook Korla fragrant pear orchards at different stand ages in Korla Shayidong Orchard spot as the investigation area.Samples were collected at every plot’s different layers to measure the soil physicochemical indexes.Meantime,the main parameters such as tree height,tree diameter at chest height,tree crown,and individual spacing were determined.After that,we detected the correlation between soil physicochemical properties and fruiter growth parameters through multiple comparison analysis(Spearman,P=0.05),and then through tracing analysis(S-N-K & Duncan,P=0.05)soil organic carbon sedimentation process and its effects to fruiter were studied.【Result】As the results showed,mature and overmature trees’ soil carbon storage was far higher than young trees’.Soil organic carbon held a notable positive correlation with tree crown and individual spacing while soil moisture content had a remarkable negative correlation with tree diameter at chest height and the crown.【Conclusion】The soil organic carbon deposition in Korla fragrant pear orchards increased with increasing age of trees and affect tree growth,the economic forestry construction,which might effectively improve the service function of the ecosystem.