藏北古露高寒草地生态系统对短期围封的响应
The response of alpine grasslands ecosystem in the north Tibet to short-term enclosure
查看参考文献35篇
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文摘
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过度放牧导致高寒草地生态系统退化,围封是生态保护和恢复的管理手段。以青藏高原那曲县古露镇过牧退化高寒草地为对象,系统分析了高寒草地生态系统的植被特征及土壤理化特性、土壤酶活性、土壤微生物生物量和群落结构对围封的响应。结果表明,短期围封后,(1)植被平均高度、盖度和地上生物量均有极显著增加(P<0.01),而生物多样性指数则显著降低(P<0.01); (2)土壤的水溶性有机碳含量、土壤物理结构(沙土与粉土的比例)及pH有显著变化(P <0.05); (3)土壤酶活性没有明显改善;(4)土壤微生物生物量(细菌、放线菌、真菌)均呈显著增加(P <0.05); (5)土壤中细菌的多样性有增加的趋势,其群落组成在门水平上也发生了变化;(6) Mantel test分析显示与土壤细菌群落结构的呈正相关性的环境因子主要为土壤有机碳含量(TOC)、总氮含量(TN)、碳磷比(C/P)与氮磷比(N/P)(P <0.05)。这表明围栏封育有利于藏北草地植被、土壤理化特性的恢复,还能维持土壤微生物多样性,促进高寒草地生态系统的可持续发展。 |
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其他语种文摘
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Alpine grasslands,an important terrestrial ecosystem,play an essential role in global carbon and nitrogen cycles. Recently, overgrazing in alpine grasslands, particularly on the Tibetan Plateau, a sensitive district subject to climate change, is a serious issue leading to their degradation and degeneration, Fencing to exclude grazers has become an important management practice to protect and re-establish the degraded grasslands on the TP. Previous studies on the alpine grassland ecosystem have focused on a certain aspect. However, a systematic study has largely been lacking. The current research was focused on the severely degraded alpine grassland in Gulu Town, Naqu County, located in the north of TP. In order to determine the effect of restoration, we studied the short-term (three-year) effects of fencing on the vegetation characteristics, soil physicochemical properties, soil enzyme activities, soil microbial biomass, and soil microbial communities, and compared them with areas where grazing was allowed. Soil enzyme activity was detected using an UV spectrophotometer. Microbial biomass was measured by phospholipid -derived fatty-acid analysis (PLFA) method. Furthermore, we also studied profiling of complex soil bacterial communities based on 16S ribosomal RNA gene (rDNA) sequences by means of Next Generation Sequencing (NGS) technologies at the Ion Personal Genome Machine (PGM) platform. After fencing for three years, the alpine grassland ecosystem differed noticeably between the fencing and grazing areas across the study sites. Our study showed that: (1) The total plant cover, average vegetation height, and aboveground biomass of vegetation determined during the above ground vegetation surveys were significantly higher in fenced areas than the areas where grazing was permitted (P<0.01). However, the diversity of vegetation (Shannon-Weiner index) in the fenced area was significantly lower than that in grazing sites (P<0.01). (2) Soil pH perceptibly decreased while the dissolved organic carbon in soil was increased after fencing. Soil structure, in terms of the ratio of sand to silt was also affected with fencing (P<0.05). (3) Soil enzyme activities were not influenced by fencing. (4) Soil microbial biomass(Bacteria, Actinomycetes, and Fungi) significantly increased in the fencing area(P<0.05). (5) There was an increasing tendency in the diversity of bacteria in soil,and the community composition of bacteria was changed at the phylum level, but there was no significant difference after fencing. (6) Further, the Mantel's test suggested that the major environmental factor, soil organic matter such as total organic carbon (TOC),total nitrogen (TN),carbon to phosphorus ratio (C/P), and nitrogen to phosphorus ratio(N/P) were affecting microbial community in the fenced sites. From these results, it can be inferred that, in the grasslands ecosystem, soil sub-system was steadier than plant community sub-system. In soil subsystem,soil microbial communities were less susceptible than soil profile characteristics in fenced grasslands. In conclusions,fencing was a valid method in reconstructing aboveground biomass in the alpine grassland on TP,thereby inducing a number of changes in the soil microbial community, including the composition and diversity of microorganisms. In future, more destroyed grassland should be fenced in order to preserve the balance of the ecosystem and to resist the effects of global climate change. More studies were needed to be conducted over longer periods of fencing to further our understanding of the effects on fencing on restoration of alpine grasslands. |
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来源
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生态学报
,2017,37(13):4366-4374 【核心库】
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DOI
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10.5846/stxb201602040259
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关键词
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短期围封
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高寒草地
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生态系统
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土壤酶活性
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土壤微生物
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地址
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1.
河北工程大学, 中国科学院高寒生态学与生物多样性重点实验室, 邯郸, 056038
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河北工程大学, 邯郸, 056038
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中国科学院青藏高原研究所, 中国科学院高寒生态学与生物多样性重点实验室, 北京, 100101
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中国科学院水利部成都山地灾害与环境研究所, 成都, 610041
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中国科学院地质与地球物理研究所兰州油气资源研究中心, 兰州, 730000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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畜牧、动物医学、狩猎、蚕、蜂 |
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基金
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国家重点基础研究发展计划(973计划)专题项目
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国家自然科学基金
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文献收藏号
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CSCD:6024137
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参考文献 共
35
共2页
|
|
1.
兰玉蓉. 青藏高原高寒草甸草地退化现状及治理对策.
青海草业,2004,13(1):27-30
|
被引
17
次
|
|
|
|
|
2.
林斌.
当雄高寒草甸草原土壤生物学特性对不同放牧措施的响应,2013
|
被引
1
次
|
|
|
|
|
3.
高英志. 放牧对草原土壤的影响.
生态学报,2004,24(4):790-797
|
被引
180
次
|
|
|
|
|
4.
Doran J W. Quantitative indicators of soil quality: a minimum data set.
Methods for Assessing Soil Quality,1996:25-37
|
被引
6
次
|
|
|
|
|
5.
朱炜歆.
青藏高原东缘草地类型、放牧干扰对土壤微生物的影响,2012
|
被引
1
次
|
|
|
|
|
6.
赵景学. 短期围栏封育对藏北3类退化高寒草地群落特征的影响.
草业科学,2011,28(1):59-62
|
被引
37
次
|
|
|
|
|
7.
赵吉. 不同放牧率对冷蒿小禾草草原土壤微生物数量和生物量的影响.
草地学报,1999,7(3):223-227
|
被引
35
次
|
|
|
|
|
8.
Holt J A. Grazing pressure and soil carbon, microbial biomass and enzyme activities in semi-arid northeastern Australia.
Applied Soil Ecology,1997,5(2):143-149
|
被引
72
次
|
|
|
|
|
9.
张成霞. 放牧对草地土壤理化特性影响的研究进展.
草业学报,2010,19(4):204-211
|
被引
89
次
|
|
|
|
|
10.
曹淑宝. 放牧对草原土壤微生物影响研究进展.
中国农学通报,2011,27(29):271-275
|
被引
4
次
|
|
|
|
|
11.
王喜明.
碳、氮添加对藏北高寒草甸土壤碳、氮矿化及氮素转化速率的影响,2014
|
被引
3
次
|
|
|
|
|
12.
鲍士旦.
土壤农化分析,1987
|
被引
2
次
|
|
|
|
|
13.
Jones D L. Experimental evaluation of methods to quantify dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) in soil.
Soil Biology and Biochemistry,2006,38(5):991-999
|
被引
208
次
|
|
|
|
|
14.
关松荫.
土壤酶及其研究法,1986
|
被引
1958
次
|
|
|
|
|
15.
White D C. Determination of the sedimentary microbial biomass by extractible lipid phosphate.
Oecologia,1979,40(1):51-62
|
被引
120
次
|
|
|
|
|
16.
干珠扎布. 喷灌对藏北高寒草地生产力和物种多样性的影响.
生态学报,2015,35(22):7485-7493
|
被引
19
次
|
|
|
|
|
17.
Peet R K. The measurement of species diversity.
Annual Review of Ecology and Systematics,1974,5(5):285-307
|
被引
99
次
|
|
|
|
|
18.
Edgar R C. UCHIME improves sensitivity and speed of chimera detection.
Bioinformatics,2011,27(16):2194-2200
|
被引
563
次
|
|
|
|
|
19.
Wang Q. Naive Bayesian classifier for rapid assignment of rRNA sequences into the new bacterial taxonomy.
Applied and Environmental Microbiology,2007,73(16):5261-5267
|
被引
666
次
|
|
|
|
|
20.
Hughes J B. Counting the uncountable: statistical approaches to estimating microbial diversity.
Applied and Environmental Microbiology,2001,67(10):4399-4406
|
被引
39
次
|
|
|
|
|
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