| 黄土丘陵区退耕草地群落盖度与地上生物量关系 |
| 贾昭; 简春霞; 熊沛枫; 陈志飞; 周俊杰
|
| 2020
|
发表期刊 | 水土保持研究
|
卷号 | 27期号:1页码:319-327 |
摘要 | 揭示黄土丘陵区退耕草地群落盖度与地上生物量的关系,对系统评价草地群落恢复潜力和水土保持效益具
有重要意义。以黄土丘陵区5个退耕年限( 5a ,
10a , 15a , 20a , 30a )草地群落为对象,通过照相法、群落调查和刈割法
测定了草地群落盖度、物种组成和地上生物量。结果表明:群落高度、盖度与地上生物量呈显著正相关关系,与物种丰
富度和 Shannon - Wiener 多样性指数呈显著负相关关系。群落盖度与地上生物量随退耕年限增加总体呈增加趋势,不
同退耕年限草地群落间物种丰富度和多样性指数无显著差异。退耕 20a 群落的植物密度、高度和单位盖度地上生物
量值均最低,盖度和地上生物量与退耕 15a 相比显著下降。各退耕年限草地群落优势种分别为: 5a 是狗尾草( Setar -
ia viridis )和达乌里胡枝子( Lespedeza davurica ), 10a 和 15a 是达乌里胡枝子和铁杆蒿( Artemisia gmelinii ), 20a
是铁杆蒿和菊叶委陵菜( Potentilla
tanacetifolia ), 30a 为长芒草( Stipa bungeana )。当草地群落盖度低于 84. 6% 时,
盖度与地上生物量呈极显著线性正相关关系,当盖度大于 84. 6% 后,群落盖度不随地上生物量增加而变化。群落盖
度 84. 6% 和地上生物量 285. 17g / m
2 可作为黄土丘陵区退耕草地植被恢复评价和调控措施的参考值。 |
其他摘要 | It is of great significance to systematically evaluate the restoration potential of grassland by revea -
ling the relationship
between coverage and aboveground biomass of different farming - withdrawn grasslands in
loess hilly - gully region.We selected five grassland communities with different withdrawn years (
5 - year , 10 -
year , 15 - year , 20
- year , 30 - year ) and three methods including photographic method , community survey and
harvest methods were employed to obtain their coverage , species composition and biomass.The result
showed that community average height had significantly positive correlation with coverage and aboveground
biomass , while there is a significant negative correlation between species richness and Shannon - Wiener diver -
sity
index ; Vegetation coverage and aboveground biomass increased with abandoned years , while species
richness and Shannon diversity index showed no significant differences among
communities ; the plant densi -
ty
, community
height and aboveground biomass per unit coverage were the lowest in the 20 - year abandoned
farmland , and vegetation coverage and aboveground biomass were significantly lower than those of 15 - year
abandoned farmland ; the dominant species for different farming - withdrawn grassland communities were :
Setaria viridis and Lespedeza davurica for the 5 - year , L . davurica and Artemisia gmelinii for 10 - year and
15 - year , A . gmelinii and Potentilla tanacetifolia for 20 - year and Stipa bungeana for 30 - year ; there was aignificant positive linear correlation between vegetation coverage and aboveground biomass , when vegetation
coverage was less than 84. 6% , and when the vegetation coverage was greater than 84. 6% , the community
coverage did not change with the increase of aboveground biomass.The values of vegetation coverage ( 84. 6% ) and
aboveground biomass ( 285. 17g / m
2 )
can be used as important references for vegetation restoration evaluation
and control measure selection in loess hilly - gully region. |
关键词 | 退耕草地
群落盖度
物种组成
地上生物量
|
收录类别 | 中文核心期刊要目总览
|
语种 | 中文
|
文献类型 | 期刊论文
|
条目标识符 | sbir.nwafu.edu.cn/handle/361005/10016
|
专题 | 水保所知识产出(1956---)
|
作者单位 | 西北农林科技大学 黄土高原土壤侵蚀与旱地农业国家重点实验室
|
推荐引用方式 GB/T 7714 |
贾昭,简春霞,熊沛枫,等. 黄土丘陵区退耕草地群落盖度与地上生物量关系[J]. 水土保持研究,2020,27(1):319-327.
|
APA |
贾昭,简春霞,熊沛枫,陈志飞,&周俊杰.(2020).黄土丘陵区退耕草地群落盖度与地上生物量关系.水土保持研究,27(1),319-327.
|
MLA |
贾昭,et al."黄土丘陵区退耕草地群落盖度与地上生物量关系".水土保持研究 27.1(2020):319-327.
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文件名:
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黄土丘陵区退耕草地群落盖度与地上生物量关系_贾昭.pdf
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