南京林业大学学报(自然科学版) ›› 2022, Vol. 46 ›› Issue (6): 195-206.doi: 10.12302/j.issn.1000-2006.202209015
所属专题: 南京林业大学120周年校庆特刊
徐晨1(), 阮宏华1,*(), 吴小巧2, 谢友超2, 杨艳2
收稿日期:
2022-09-06
修回日期:
2022-10-10
出版日期:
2022-11-30
发布日期:
2022-11-24
通讯作者:
阮宏华
基金资助:
XU Chen1(), RUAN Honghua1,*(), WU Xiaoqiao2, XIE Youchao2, YANG Yan2
Received:
2022-09-06
Revised:
2022-10-10
Online:
2022-11-30
Published:
2022-11-24
Contact:
RUAN Honghua
摘要:
随着全球气候变暖趋势加剧,伴之而来的干旱问题成为全球关注的热点。干旱对森林生态系统碳积累和周转可能产生显著影响,其主要过程包括植被地上部分和地下部分凋落物对土壤有机碳的输入、凋落物的分解及土壤有机碳的矿化等。笔者综合分析了近年来国内外相关研究成果,对干旱影响森林土壤有机碳的主要过程与机制进行了归纳和总结,结果表明:①干旱通过促进叶片提前脱落,短期增加森林凋落物量,长期干旱则影响森林植物生长,降低森林初级生产力从而降低植物地上凋落物量。轻度和中度干旱下植物为补偿水分缺失增加细根生物量维持植物生命力,重度干旱下植物丧失自我修复能力导致细根生物量降低,干旱也会造成细根死亡率增加。平均而言,全球范围内干旱会造成森林凋落物量降低(1.9%)和细根生物量降低(8.7%),最终减少植物有机碳向土壤的输入量。②干旱可通过改变凋落物化学性质,对分解者——土壤动物、微生物产生胁迫,从而引起凋落物分解速率下降(10%~70%)。干旱使凋落物碳氮含量变化,造成凋落物次生代谢物,如纤维素、木质素、单宁等积累,改变根系分泌物化学组分,从而影响凋落物分解。干旱导致真菌生物量和分解者等土壤动物丰度降低,增加分解者捕食压力,使相关微生物和酶活性下降,造成凋落物分解速率下降。③干旱驱动微生物群落组成变化(真菌细菌比、革兰阳阴细菌比增加),造成微生物生物量下降,活性减弱,此外还会降低腐食动物的摄食活性、酶活性,最终导致土壤有机碳矿化速率下降(10%~50%)。④干旱对土壤有机碳不同组分影响不同,干旱会减小土壤微生物生物量碳(MBC)库(2%~30%),造成表层土壤溶解性有机碳(DOC)积累(30%~60%)。而在全球范围内的不同区域,干旱对土壤有机碳积累的影响也不同,亚热带森林中干旱对土壤有机碳积累的影响多是负面的,热带森林中则相反。总体而言,干旱对森林土壤有机碳库储量影响可能不大,但降低了土壤碳周转效率。而森林土壤有机碳周转过程不仅受干旱这一单一因素影响,温度、物种等因素会共同作用于土壤有机碳的周转与积累,且单因子的简单叠加模拟可能与现实环境中多因子综合对土壤碳通量的影响有一定差别。未来需要通过长期观测、延长控制实验时间、模拟原生环境条件等,开展多因素综合实验,加强干旱对土壤动物和微生物影响的研究,以深入了解干旱对森林土壤有机碳影响的生物学与生态学的过程与机制。
中图分类号:
徐晨,阮宏华,吴小巧,等. 干旱影响森林土壤有机碳周转及积累的研究进展[J]. 南京林业大学学报(自然科学版), 2022, 46(6): 195-206.
XU Chen, RUAN Honghua, WU Xiaoqiao, XIE Youchao, YANG Yan. Progresses in drought stress on the accumulation and turnover of soil organic carbon in forests[J].Journal of Nanjing Forestry University (Natural Science Edition), 2022, 46(6): 195-206.DOI: 10.12302/j.issn.1000-2006.202209015.
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