Increased Litter Greatly Enhancing Soil Respiration in Betula platyphylla Forests of Permafrost Region, Northeast China
Increased Litter Greatly Enhancing Soil Respiration in Betula platyphylla Forests of Permafrost Region, Northeast China
复制标题
凋落物增加极大增强了中国东北多年冻土区白桦林的土壤呼吸
DOI：
10.3390/f12010089
复制
发表时间：
2021-01
期刊：
影响因子：
2.9
通讯作者：
Xiuling Man
中科院分区：
文献类型：
--
作者：
Hong Wei;Xiuling Man
凋落物输入量的变化通过影响土壤有机碳和养分的有效性，调节土壤微环境，进而影响土壤呼吸，从而对森林生态系统土壤碳循环产生深远影响。2018年5 - 10月，在我国东北多年冻土区不同林龄白桦林（25、40和61年生）进行了凋落物量调控试验，每种林分设置加倍凋落物（增加凋落物，DL）、排除凋落物（无凋落物，NL）和对照凋落物（CK）。结果表明，NL处理的Rs较CK处理降低。效应大小随林龄的增加而减小，25年生白桦幼林减小幅度最大（24.46%），随着林龄的增加而趋于稳定，40年生和61年生白桦幼林分别减小15.65%和15.23%。DL处理25、40和61年生林分的RS分别增加了27.38%、23.83%和23.58%。我们的研究结果还表明，由DL处理所造成的增加大于由NL处理所造成的减少，导致启动效应，特别是在40和61岁的林分。凋落物输入量的变化是影响凋落物处理下RS变化的主要因素。土壤温度也是影响不同林龄林分枯落物对Rs贡献率的主要因子，与Rs呈显著的指数正相关。这表明，有一个显着的凋落物和Rs之间的关系，从而影响土壤碳循环白桦林多年冻土区，中国东北。研究结果表明，白桦林凋落物的增加增加了呼吸强度，从而可能增加未来气候变暖过程中的碳排放。这对我国东北多年冻土区今后的森林经营具有重要意义。
The change of litter input can affect soil respiration (Rs) by influencing the availability of soil organic carbon and nutrients, regulating soil microenvironments, thus resulting in a profound influence on soil carbon cycle of the forest ecosystem. We conducted an aboveground litterfall manipulation experiment in different-aged Betula platyphylla forests (25-, 40- and 61-year-old) of the permafrost region, located in the northeast of China, during May to October in 2018, with each stand treated with doubling litter (litter addition, DL), litter exclusion (no-litter, NL) and control litter (CK). Our results indicated that Rs decreased under NL treatment compared with CK treatment. The effect size lessened with the increase in the stand age; the greatest reduction was found for young Betula platyphylla forest (24.46% for 25-year-old stand) and tended to stabilize with the growth of forest with the reduction of 15.65% and 15.23% for 40-and 61- year-old stands, respectively. Meanwhile, under DL treatment, Rs increased by 27.38%, 23.83% and 23.58% on 25-, 40- and 61-year-old stands, respectively. Our results also showed that the increase caused by DL treatment was larger than the reduction caused by NL treatment, leading to a priming effect, especially on 40- and 61-year-old stands. The change in litter input was the principal factor affecting the change of Rs under litter manipulation. The soil temperature was also a main factor affecting the contribution rate of litter to Rs of different-aged stands, which had a significant positive exponential correlation with Rs. This suggests that there is a significant relationship between litter and Rs, which consequently influences the soil carbon cycle in Betula platyphylla forests of the permafrost region, Northeast China. Our finding indicated the increased litter enhanced the Rs in Betula platyphylla forest, which may consequently increase the carbon emission in a warming climate in the future. It is of great importance for future forest management in the permafrost region, Northeast China.
登录
查看更多内容
黑龙江省大兴安岭中部三类次生林自然更新过程中的空间格局和种间关联
影响因子：
2.9
作者：
Zhang Lingyu;Dong Lingbo;Liu Qiang;Liu Zhaogang
通讯作者：
Liu Zhaogang
林龄调节华北落叶松人工林土壤呼吸对温度的响应
影响因子：
6.2
作者：
Yue, Chao;Yue, Chao;Yang, Yan;Yang, Yan
通讯作者：
Yang, Yan
影响因子：
4
作者：
C. Gough;J. Seiler;P. Eric;Wise Man;Christopher A. Maier
通讯作者：
C. Gough;J. Seiler;P. Eric;Wise Man;Christopher A. Maier
影响因子：
3.2
作者：
L. Duan;Xiu-ling Man;B. Kurylyk;Tijiu Cai;Qiang Li
通讯作者：
L. Duan;Xiu-ling Man;B. Kurylyk;Tijiu Cai;Qiang Li
影响因子：
--
作者：
Wenlong Gao;Wei Zhao;Hao Yang;Haijun Yang;Gao-qi Chen;Yachen Luo;H. Fang;Shenggong Li
通讯作者：
Wenlong Gao;Wei Zhao;Hao Yang;Haijun Yang;Gao-qi Chen;Yachen Luo;H. Fang;Shenggong Li