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[1]周春梅 刘琳** 申旭东 高武超 李其 孙飞达 赵景学 周冀琼.青藏高原东部高寒沙化草地中高山柳凋落叶分解特征的空间异质性*[J].应用与环境生物学报,2019,25(06):1-11.[doi:10.19675/j.cnki.1006-687x.2018.12057]
 ZHOU Chunmei,LIU Lin**,SHEN Xudong,et al.Spatial heterogeneity of decomposition characteristics on litter leaf of Salix cupularis in an alpine desertified meadow ecosystem of the eastern Tibetan Plateau*[J].Chinese Journal of Applied & Environmental Biology,2019,25(06):1-11.[doi:10.19675/j.cnki.1006-687x.2018.12057]
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青藏高原东部高寒沙化草地中高山柳凋落叶分解特征的空间异质性*()
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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06期
页码:
1-11
栏目:
研究论文
出版日期:
2019-12-30

文章信息/Info

Title:
Spatial heterogeneity of decomposition characteristics on litter leaf of Salix cupularis in an alpine desertified meadow ecosystem of the eastern Tibetan Plateau*
作者:
周春梅 刘琳** 申旭东 高武超 李其 孙飞达 赵景学 周冀琼
四川农业大学动物科技学院 成都 611130
Author(s):
ZHOU Chunmei LIU Lin** SHEN Xudong GAO Wuchao LI Qi SUN FeidaZHAO Jingxue & ZHOU Jiqiong
Animal Science and Technology College of Sichuan Agricultural University, Chengdu 611130, China
关键词:
高山柳凋落叶凋落物碳凋落物氮纤维素木质素沙化草地
Keywords:
Salix cupularis leaf litter litter C litter N cellulose lignin desertified grassland
DOI:
10.19675/j.cnki.1006-687x.2018.12057
摘要:
凋落物分解是生态系统碳氮循环的重要环节,为探究青藏高原东部沙化草地中高山柳(Salix cupularis)凋落叶的分解及其对灌木“肥岛”形成的影响,采用分解袋法研究不同大小高山柳灌丛冠幅下不同微位置(茎基周围、冠幅最小半径圈、灌丛间裸地)高山柳凋落叶的分解特征。结果表明:(1)分解时间显著影响高山柳凋落叶分解及养分释放过程,随着分解时间延长凋落叶木质素含量无显著变化,凋落叶质量损失率、C和N含量均显著增加(P<0.05),且凋落叶C/N和木质素/N均显著降低(P<0.05)。(2)高山柳灌丛冠幅越小,其凋落叶质量损失率越高;且不同微位置下,高山柳凋落叶质量损失率外圈>中圈>内圈(P<0.05)。(3)大冠幅的高山柳下,凋落叶N含量显著高于小冠幅的高山柳(P<0.05),但不同微位置未引起C(总有机碳、纤维素和木质素)和N养分含量变化的显著差异。总之,在高山柳凋落叶分解初期(即,第一年),高山柳灌丛冠幅大小仅影响其质量和N含量;无论高山柳灌丛冠幅大小如何,不同微位置下高山柳凋落叶养分含量无显著差异,这表明短期内高山柳凋落叶的分解对其“肥岛”的形成可能没有显著贡献。(图4表1参59)
Abstract:
Litter decomposition is an important part of the ecosystem carbon and nitrogen cycle. Therefore, this paper attempts to explore the decomposition of Salix cupularis leaf litter in the desertified grassland in eastern Qinghai-Tibet Plateau, and to find out the effect of Salix cupularis litter decomposition on the formation of " fertile island " under the Salix cupularis bush. The field litterbag experiment was conducted to study the decomposition of litter under different microsites (i.e., central-inner cycle around the stem base, middle-middle cycle along the minimum radius, and interspace- outer cycle on the bare land) around Salix cupularis with different sizes (i.e., large, medium, and small size). The results showed that: (1) Decomposition time significantly affected the decomposition and nutrient release process of S. cupularis leaf litter, which although lignin content did not change significantly with the extension of time, but the mass loss of litter, C and N contents increased significantly (P<0.05), as well as both C/N and lignin/N reduced significantly with the extension of time (P<0.05). (2) The loss rate of litter quality was higher when the size of S. cupularis was smaller, and the order of mass loss rates was: interspace > middle > central under different microsites (P<0.05). (3) The N content of litter leaf was higher significantly around large-size than small-size S. cupularis (P<0.05), and microsites did not cause significant difference in the release of C (i.e., total organic carbon, cellulose and lignin) and N nutrients. In summary, with regardless of shrub size, the different microsites did not cause significantly difference in the nutrient release of S. cupularis leaf litter, which indicated the litter decomposition attributed insignificantly to the formation of the "fertile island" of S. cupularis during the early of the decomposition of S. cupularis leaf litter, i.e. for the first year.

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备注/Memo

备注/Memo:
收稿日期 Received: 2018-12-27 接受日期 Accepted: 2019-04-05
*四川省科技厅国际合作项目(2016HH0087)和四川省人社厅留学人员科技活动项目择优资助优秀类资助
**通讯作者 Corresponding author (E-mail: liulinsky@126.com)
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更新日期/Last Update: 2019-04-12