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[1]周天阳,王金牛,徐 波 周海燕 谢 雨 吴 彦.季节性积雪下高山草地凋落物分解[J].应用与环境生物学报,2019,25(01):1-12.[doi:10.19675/j.cnki.1006-687x.2018.04013]
 ZHOU Tianyang,WANG Jinniu,et al.Litter decomposition of alpine meadow under the seasonal snow cover*[J].Chinese Journal of Applied & Environmental Biology,2019,25(01):1-12.[doi:10.19675/j.cnki.1006-687x.2018.04013]
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季节性积雪下高山草地凋落物分解()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年01期
页码:
1-12
栏目:
研究论文
出版日期:
2019-01-30

文章信息/Info

Title:
Litter decomposition of alpine meadow under the seasonal snow cover*
文章编号:
201804013
作者:
周天阳 2 王金牛1 3 徐 波4 周海燕5 谢 雨1 吴 彦1
1中国科学院成都生物研究所 成都 610041?
2中国科学院大学 北京 101408?
3国际山地综合发展中心 加德满都
4阿坝师范学院 阿坝 623402
5内江市农业科学院 内江 641000
Author(s):
ZHOU Tianyang 1 2 WANG Jinniu1 3** XU Bo4 ZHOU Haiyan5 XIE Yu1 WU Yan 1**
1 Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China ?
2 University of Chinese Academy Sciences, Beijing 100049, China?
?3 International Center for Integrated Mountain Development (ICIMOD), Kathmandu, Nepal?
4 Aba Teachers University, Aba 623002, China?
?5 NeiJiang Academy of Agricultural Sciences , Neijiang 641000, China
关键词:
凋落物产量分解率雪被土壤微生物生物量碳氮土壤温度
Keywords:
litter production double-faced litter bag decomposition rate snow bed soil microbial biomass soil temperature
DOI:
10.19675/j.cnki.1006-687x.2018.04013
摘要:
青藏高原高山草地的凋落物分解是其生物地化循环过程的重要一环。本文采用样方调查法估测了两种典型地形条件下高山草地单位面积的年凋落物产量,分析定面积凋落物分解袋中的初始装袋量与凋落物分解率的关系,估算了最佳初始凋落物装袋量。通过积雪期设置双面凋落物分解袋于浅雪、深雪、无雪及人工雪被处理下,比较不同的雪被处理下凋落物的分解率,同时测定对应的土壤温度及土壤微生物生物量碳氮含量,进而分析土壤微生物生物量碳氮与凋落物分解率之间的相关关系。研究发现:1)两种典型样地内植物凋落物在自然状态下的年产生量均约为90 g·m-2;2)非生长季中凋落物分解率与凋落物初始重量呈负线性相关,凋落物初始装袋量3 g是研究分解率的相对较佳重量;3)随着积雪厚度的增加,非生长季土壤温度和凋落物分解率提高。同时也促进了土壤微生物生物量的积累。凋落物分解率和土壤微生物生物量碳、氮在深雪与无雪处理下分别达到最大值(分别为10.15%, 156.37 mg·kg-1, 75.89 mg·kg-1)和最小值(分别为3.07%, 65.38 mg·kg-1, 20.17 mg·kg-1)。土壤微生物生物量碳、氮均与凋落物分解率呈显著相关性(P < 0.05)。综上所述,即便在冬季气温低于冰点的情况下,雪被的隔绝作用使得土壤微生物活动依然活跃进行。雪被变化既改变了土壤环境因子及凋落物分解率,也深刻影响着高山草地生态系统的结构与功能。(图5表2参43)
Abstract:
Litter decomposition is an important fraction of biogeochemical cycles in alpine meadows of eastern Tibetan Plateau under long lasting snow cover. This study aimed to conduct annual plant litter production and determine appropriate litter mass in a fixed-area litter bag. Then, the decomposition rate of plant litter was compared under different snow depths. Lastly, it was analyzed the relationships of litter decomposition rate with soil microbial biomass.The annual litter production per unit area had been calculated by quadrat method at two typical topographic sites. Double-faced litter bag was applied to get suitable litter mass for packing, and to evaluate decomposition rates of the plant litter under four treatments, i.e. deep snow bed (Deep), shallow snow bed (Shallow), without snow bed cover treatment (None) , and artificial snow bed cover treatment ( Artificial). Besides, soil temperature and soil microbial biomass were logged and tested during the whole experiment period.The results indicate d that, 1) the plant litter production in situ was about 90 g·m-2; 2) litter decomposition rate showed a negative linear regression with the litter mass in the litter bag with fixed-area, and 3 g litter mass was appropriate amount to measure decomposition rates in the study; 3) soil temperature and litter decomposition rate increased with the depth of snow cover, which also promoted the accumulation of soil microbial biomass. Litter decomposition rate and soil microbial biomass were highest ( decomposition rate: 10.15%, MBC: 156.37 mg·kg-1, MBN: 75.89 m g·kg-1) under maximum snow depth and lowest ( decomposition rate: 3.07%, MBC: 65.38 mg·kg-1, MBN: 20.17 m g·kg-1) in the treatment without snow bed cover , respectively.The above results demonstrate d that many ecological processes in winter can still persist for the insulation effect of snow cover given at near freezing temperatures. Therefore, the variation of snowpack accumulation can affect the structure and function of an alpine meadow ecosystem in the eastern Tibetan Plateau not just altering plant litter decomposition rate.

备注/Memo

备注/Memo:
收稿日期: 2018-04-09 接受日期 Accepted: 2018-05-09
*国家自然科学基金(41661144045,31400389)和中国博士后科学基金(2014M552385)资助?
**通讯作者(E-mail: wangjn@cib.ac.cn; wuyan@cib.ac.cn)
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更新日期/Last Update: 2018-07-13