Effect of snowmelt time on growth and reproduction of Pedicularis davidii var. pentodon in the eastern Tibetan Plateau
Effect of snowmelt time on growth and reproduction of Pedicularis davidii var. pentodon in the eastern Tibetan Plateau
复制标题
融雪时间对马先蒿生长繁殖的影响
DOI：
10.1080/11263504.2011.599989
复制
发表时间：
2011-12
期刊：
影响因子：
--
通讯作者：
中科院分区：
文献类型：
--
作者：
摘要 山马先蒿的生长与繁殖。变种五齿龙 Tsoong 是青藏高原东部的一种雪岸物种，我们沿着四段的融雪梯度进行了研究。无雪期土壤含水量和3-5月土壤表层日温幅值区间间差异显着，而土壤养分和pH值无差异。该物种没有出现在早期融化段。茎高、每茎叶数、叶大小和比叶面积沿其余节显着增加。地上生物量和总生物量表现出相似的趋势，而地下生物量和地下与地上生物量的比率沿梯度下降。花序下部和中部的花数、每花种子数和千粒重增加，而花序上部沿梯度几乎保持不变。就整个花序而言，这些繁殖特征从雪堆融化早到晚的部分逐渐增强。人口密度也沿着融雪梯度增加。其分布和生长规律主要与土壤表面附近的日冻融循环和土壤含水量有关。
Abstract The growth and reproduction of Pedicularis davidii Franch. var. pentodon Tsoong, a snowbank species in the eastern Tibetan Plateau, was studied along a snowmelt gradient of four segments. Soil water content in the snow-free period and amplitude of diurnal soil surface temperature in March to May were significantly different between the segments, whereas soil nutrients and pH showed no difference. The species did not occur at the early-melting segment. Stem height, leaf number per stem, leaf size and specific leaf area increased significantly along the remaining segments. Above-ground biomass and total biomass showed a similar trend, while below-ground biomass and the ratio of below- to above-ground biomass decreased along the gradient. Flower number, seeds per flower and 1000-seed weight increased in the lower and middle parts of an inflorescence, while they kept almost constant in upper part of an inflorescence along the gradient. As far as a whole inflorescence was concerned, these reproductive characteristics increased from early- to late-melting segments of the snowbank. Population density also increased along the snowmelt gradient. The distribution and growth pattern were mainly related to diurnal freeze–thaw cycles near the soil surface and soil water content.
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DOI：
10.2307/1551922
发表时间：
1993-11-01
期刊：
ARCTIC AND ALPINE RESEARCH
影响因子：
--
作者：
MOLAU, U
通讯作者：
MOLAU, U
影响因子：
1.1
作者：
G. Kudo
通讯作者：
G. Kudo
影响因子：
2
作者：
Hiroki Yamagishi;T. Allison;M. Ohara
通讯作者：
Hiroki Yamagishi;T. Allison;M. Ohara
影响因子：
2.8
作者：
Busing, RT;Fujimori, T
通讯作者：
Fujimori, T
DOI：
10.2307/1551685
发表时间：
1991-11-01
期刊：
ARCTIC AND ALPINE RESEARCH
影响因子：
--
作者：
KUDO, G
通讯作者：
KUDO, G