干旱区生态环境知识资源中心(Arid): 短花针茅生长和繁殖策略对载畜率的响应

Arid

	短花针茅生长和繁殖策略对载畜率的响应
其他题名	The Response of Growth and Reproduction for Stipa breviflora to Different Stocking Rates
	古琛; 赵天启; 王亚婷; 王玺; 贾丽欣; 赵萌莉
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2017
卷号	26 期号:1 页码:36-42
中文摘要	生长和繁殖是植物的两个最基本的生命过程,二者之间的资源分配是植物生活史策略的核心问题。为了响应家畜放牧的干扰,草原植物需要不断地在营养生长和生殖生长之间进行调节。试验以内蒙古荒漠草原为研究对象,采用4个载畜率水平完全随机区组试验设计,研究荒漠草原建群种短花针茅(Stipa breviflora)生长和繁殖策略对不同载畜率的响应,对揭示短花针茅应对放牧干扰的响应策略有重要的生态学意义,也可为荒漠草原生态系统的保护和放牧利用提供参考。结果表明:(1)短花针茅种群盖度在轻度放牧区显著增大,在重度放牧区显著降低(P<0.0001),其种群和株丛地上生物量、高度均随载畜率的增大而显著降低(P<0.0001),但密度随载畜率的增大而增大(P<0.0001);(2)轻度放牧区短花针茅的分蘖数(P=0.048)和株丛径(P=0.023)显著高于其他处理,且分蘖节深度随着载畜率的增大而显著变浅(P=0.042);(3)轻度放牧显著增加了短花针茅的种子产量,重度放牧使之显著降低(P<0.0001),且种子生物量占植株地上生物量的比例在轻度放牧区最高(P<0.0001);(4)短花针茅总分枝数和生殖枝数在轻度放牧区最多(P<0.0001),随着载畜率的增大而显著减少,重度放牧显著降低了生殖枝所占比例而显著提高了营养枝的比例(P<0.0001)。短花针茅的生长、分蘖(无性繁殖)和有性生殖在轻度放牧区均显著升高,而随着载畜率的增大而显著降低,说明轻度放牧(载畜率为0.91sheep·hm~(-2)·0.5 a~(-1))是短花针茅种群的最适载畜率,也是其生长和繁殖的载畜率阈值。
英文摘要	Resource allocation between growth and reproduction, the two basic life processes, are the core of plant life-history strategy. Plants have to balance the sexual and asexual reproduction to adapt to grazing disturbance. In our study, a completely randomized block design experiment with four different stocking rates was set up in the field to investigate the effects of different stocking rates on the growth and reproduction of Stipa breviflora, the dominant specie on desert steppe in Inner Mongolia. It is of ecological significance to reveal the response of S. breviflora from grazing disturbance. This study provides a reference for the protection of desert steppe ecosystem, as well as, grassland grazing management. Results showed that: (1) The foliage coverage of S. breviflora was higher under light grazing and lower under heavy grazing (P<0.0001), while the aboveground biomass both for communities and individual and height decreased (P<0.0001) but the density conversely increased (P<0.0001) with the increase in stocking rates. (2) Both number of tillers (P=0.048) and diameter (P=0.023) of S. breviflora tussock increased under light grazing, and tillers depth decreased (P=0.042) with increasing stocking rates. (3) The seed yield and proportion of S. breviflora was highest with light grazing but decreased in heavy grazing (P<0.0001). And (4) likewise, both the total and reproductive tillers of S. breviflora were highest (P<0.0001) under light grazing, and then decreased with increasing stocking rates, under heavy grazing, the proportion of reproductive tillers was decreased, while vegetative tillers’ proportion increased (P<0.0001). Growth promotion of S. breviflora, as well as, tillers and reproduction were heightened by light grazing, but decreased with increase stocking rates. Results suggested that light grazing (stocking rate is 0.91 sheep·hm~(-2)·0.5 a~(-1)) is the optimal stocking rate and the threshold for both of the growth and reproduction of S. breviflora in desert steppe of Inner Mongolia.
中文关键词	荒漠草原 ; 放牧强度 ; 种群特征 ; 分蘖 ; 有性生殖
英文关键词	desert steppe grazing intensity community trait tiller sexual reproduction
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5954085
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236394
作者单位	内蒙古农业大学草原与资源环境学院, 呼和浩特, 内蒙古 010019, 中国
推荐引用方式 GB/T 7714	古琛,赵天启,王亚婷,等. 短花针茅生长和繁殖策略对载畜率的响应[J]. 内蒙古农业大学,2017,26(1):36-42.
APA	古琛,赵天启,王亚婷,王玺,贾丽欣,&赵萌莉.(2017).短花针茅生长和繁殖策略对载畜率的响应.生态环境学报,26(1),36-42.
MLA	古琛,et al."短花针茅生长和繁殖策略对载畜率的响应".生态环境学报 26.1(2017):36-42.