黄土丘陵沟壑区刺槐混交林生态化学计量特征与碳储量  

Ecological Stoichiometry and Carbon Storage of Robinia pseudoacacia Mixed Forests in the Hilly-gully Area of the Loess Plateau

作　　者：焦秋燕 黄林嘉 张娟娟[3] 张旭[3] 黄宁 郭珍 曹扬[1,6] JIAO Qiuyan;HUANG Linjia;ZHANG Juanjuan;ZHANG Xu;HUANG Ning;GUO Zhen;CAO Yang(Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100;University of Chinese Academy of Sciences, Beijing 100049;College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100;Soil and Water Conservation Service Center of Beichuan Qiang Autonomous County, Beichuan Qiang Autonomous County, Sichuan 622750;Sichuan Huabiao Testing Technology Co., Ltd., Chengdu 610066;State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100)

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨凌712100 [2]中国科学院大学,北京100049 [3]西北农林科技大学林学院,陕西杨凌712100 [4]北川羌族自治县水土保持服务中心,四川北川羌族自治县622750 [5]四川华标测检测技术有限公司,成都610066 [6]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《水土保持学报》2022年第2期238-246,共9页Journal of Soil and Water Conservation

基　　金：黄土丘陵区刺槐沙棘混交林种间养分协调机制研究(41977418)。

摘　　要：为了探讨混交林与纯林养分状况和固碳能力的差异,以黄土丘陵沟壑区刺槐(Robinia pseudoacacia)纯林、油松(Pinus tabuliformis)纯林以及刺槐+油松(Robinia pseudoacacia+Pinus tabuliformis)混交林、刺槐+山杨(Robinia pseudoacacia+Populus davidiana)混交林为对象,通过野外调查和室内分析相结合的方式,研究混交林与纯林生态系统的生态化学计量特征与碳储量。结果表明:(1)刺槐+油松混交林显著增加刺槐枝和根的C含量和叶、干的P含量及枝的C∶P与N∶P,并显著增加油松叶、枝和根的N含量和枝、干、根的N∶P,但显著降低油松各器官的C∶N,而刺槐+山杨混交林仅显著增加刺槐枝的P含量。(2)刺槐+油松混交林的土壤C含量显著高于刺槐纯林,土壤P含量显著低于油松纯林;刺槐+山杨混交林与刺槐纯林土壤P含量差异不显著。(3)总体纯林中乔木叶片与凋落物的C含量显著相关,C∶N、C∶P在乔叶—凋落物—土壤中均显著相关;但在总体混交林中仅有凋落物与土壤中的P含量与C∶P显著相关。(4)刺槐+山杨混交林乔木层碳储量显著高于刺槐纯林,刺槐+油松混交林林下植被层与土壤层碳储量显著高于刺槐纯林。研究结果为深入了解黄土高原养分循环机制奠定基础,同时也为黄土高原人工林的经营管理提供理论依据。To investigate the differences of nutrient status and carbon(C)sequestration capacity between mixed forests and pure forests,the pure forests of Robinia pseudoacacia,pure forests of Pinus tabuliformis,mixed forests of Robinia pseudoacacia and Pinus tabuliformis,and mixed forests of Robinia pseudoacacia and Populus davidiana,located in Loess Hilly and gully region of China,were taken as the objects.Through the field investigation and indoor analysis,the ecological stoichiometry and C storage of the pure and mixed forests ecosystems were studied.The results showed that:(1)Compared with the pure forests,the mixed forests of Robinia pseudoacacia and Pinus tabuliformis significantly increased the C contents of branches and roots,the phosphorus(P)contents of leaves and trunks,the C∶P and N∶P ratio of branches of Robinia pseudoacacia species,and also significantly increased the nitrogen(N)contents of leaves,branches and roots and the N∶P ratio of branches,trunks and roots of Pinus tabuliformis species,but significantly decreased the C∶N ratio of all organs of Pinus tabuliformis species,while the mixed forests of Robinia pseudoacacia and Populus davidiana only significantly increased the P content of branches of Robinia pseudoacacia.(2)The content of soil C in the mixed forests of Robinia pseudoacacia and Pinus tabuliformis was significantly higher than that of the pure Robinia pseudoacacia forests,and the content of soil P was significantly lower than that of the pure Pinus tabuliformis forests.The differences of P in the soils between the mixed forests of Robinia pseudoacacia and Populus davidiana and the pure forests of Robinia pseudoacacia were not significant.(3)There was a significant correlation between the leaf and litter C contents in two pure forests.And the C∶N,C∶P ratios of the total pure forests were significantly correlated between tree leaf-litter-soil;but in total mixed forests,only P contents in litter and soil were significantly correlated with C∶P ratio.(4)The C storage in tree layer of m

关 键 词：刺槐 油松 混交林 养分含量 碳储量 

分 类 号：S714.5[农业科学—林学]