[1]谢育利,陈云明,唐亚坤,等.地表凋落物对油松、沙棘人工林土壤呼吸的影响[J].水土保持研究,2017,24(06):52-61.
　XIE Yuli,CHEN Yunming,TANG Yakun,et al.Impact of Aboveground Litterfall on Soil Respiration in the Pinus tabulaeformis and Hippophae rhamnoides Plantations[J].Research of Soil and Water Conservation,2017,24(06):52-61.
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地表凋落物对油松、沙棘人工林土壤呼吸的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 24 期数: 2017年06期 页码: 52-61 栏目: 出版日期: 2017-11-24
Title:
Impact of Aboveground Litterfall on Soil Respiration in the Pinus tabulaeformis and Hippophae rhamnoides Plantations
作者:
谢育利1, 陈云明1,2, 唐亚坤2, 吴旭1, 温杰3
1. 中国科学院 教育部 水土保持与生态环境研究中心, 陕西 杨凌 712100;
2. 西北农林科技大学 水土保持研究所, 陕西 杨凌 712100;
3. 西北农林科技大学 林学院, 陕西 杨凌 712100
Author(s):
XIE Yuli1, CHEN Yunming1,2, TANG Yakun2, WU Xu1, WEN Jie3
1. Research Center of Institute of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China
关键词:
凋落物; 人工林; 土壤呼吸; 土壤温度; 土壤含水量
Keywords:
litterfall; plantation; soil respiration; soil temperature; soil water content
分类号:
S718.55
摘要:
通过对黄土丘陵区油松、沙棘人工林自然组（含凋落物）和去凋组（不含凋落物）土壤呼吸、5 cm土壤温度和含水量的监测，研究地表凋落物对土壤呼吸的影响。在两种林分内分别设置20 m×20 m样地，样地内随机设置5个观测点，于2015年6月到2016年5月使用LI-8100系统进行监测。结果表明：（1）自然组油松林和沙棘林土壤呼吸季节动态及日动态均表现为单峰型变化曲线，沙棘土壤呼吸年均值[2.10 μmol/（m2·s）]显著高于油松[1.56 μmol/（m2·s），p<0.05]；去除凋落物后，两种林分土壤呼吸与自然组具有相似的季节及日动态特征，但土壤呼吸年均值不存在显著性差异。（2）沙棘林自然组土壤呼吸年均值显著高于去凋组[1.58 μmol/（m2·s），p<0.05]，凋落物呼吸对土壤总呼吸的贡献率为15.81%；油松林自然组与去凋组土壤呼吸年均值差异不显著，凋落物呼吸对土壤总呼吸的贡献率仅为1.61%。（3）自然组和去凋组中油松、沙棘林土壤呼吸与温度均存在显著指数关系（p<0.05），与含水量则存在显著线性负相关关系（p<0.05）；两组处理土壤温度和含水量对土壤呼吸的单独解释量均较低（0.05%~37.82%），土壤呼吸主要受到温度和含水量共同作用的影响（8.01%~66.44%）。地表凋落物显著提高了沙棘林土壤呼吸的Q10和土壤呼吸量，但仅显著提高了油松林的Q10，对土壤呼吸量并未显著增加。油松林作为黄土丘陵区水土保持及生态恢复的造林树种更有利于该地区林地碳汇功能的提升。
Abstract:
The effects of surface litterfall on the soil respiration (Rs) were studied base on observation of Rs, soil temperature(T) and soil water content (W) at 5 cm depth under natural group (with litterfall) and exclusive group (without litterfall) treatments in Pinus tabulaeformis and Hippophae rhamnoides plantations in the hilly Loess Plateau region. Two plots (20 m×20 m) were established in these two plantations with 5 sampling points randomly set up in each plot. Rs, T and W were simultaneously monitored by LI-8100 soil flux system from June 2015 to May 2016 in these plots. The results showed that:(1) the seasonal and daily variation of Rs in the two plantations under natural group exhibited unimodal curve, and the annual average Rs in H.rhamnoides plantation[2.10 μmol/(m2·s)] was significantly higher than that in P.tabulaeformis plantation[1.56 μmol/(m2·s),p<0.05]. After removal of the litterfall, seasonal and daily dynamic of Rs in the two plantations were similar to that in natural group, and the annual average Rs in exclusive group did not exhibit significant differences for both forest stands; (2) the annual average Rs in natural group was significantly higher than in exclusive group[1.58 μmol/(m2·s),p<0.05] for H.rhamnoides plantation, with a contribution of 15.81% occupied by litterfall respiartion; however, no significant difference of annual average Rs between natural and exclusive group was observed in P.tabulaeformis plantation,and the contribution of litterfall to soil respiration was only 1.61%; (3) Rs under natural and exclusive groups were both exponentially correlated with T and negative linearly correlated with W on daily and seasonal scales in these two plantations (p<0.05); T and W (8.01%~66.44%) together could better explain the variation of Rs than T or W alone (0.05%~37.82%) in both plantations under natural and exclusive group; litterfall significantly enhanced both the temperature sensitivity of Rs and Rs amount in H.rhamnoides plantation, but only significantly improved temperature sensitivity of Rs in the P.tabulaeformis plantation. As an important tree species for soil and water conservation and ecological restoration in the hilly Loess Plateau region, the P.tabulaeformis was more conducive to the improvement of carbon sequestration function of forestland in the region.

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备注/Memo

收稿日期:2016-12-12;改回日期:2017-01-07。
基金项目:国家自然科学基金“黄土丘陵区油松和沙棘人工林的水分来源变化及其生理响应研究”（41501576）；公益性行业（国家气象局）科研专项（重大专项）“干旱气象科学研究—我国北方干旱致灾过程及机理”（GYHY2015060013）
作者简介:谢育利(1989-),女,广西玉林人,硕士研究生,主要研究方向:人工林土壤呼吸。E-mail:1406599313@qq.com
通讯作者:陈云明(1967-),男,陕西渭南人,博士,研究员,主要研究方向:黄土高原植被与水土保持。E-mail:ymchen@ms.iswc.ac.cn

更新日期/Last Update: 1900-01-01