降水变化对红砂种子萌发和出苗的影响

	降水变化对红砂种子萌发和出苗的影响
其他题名	Effects of precipitation on seed germination and seedling emergence of Reaumuria soongarica
	王珊 1; 单立山 2; 张正中 3; 苏铭 4; 李毅 5; 白蕾 6
	2019
发表期刊	中国水土保持科学
ISSN	2096-2673
卷号	17 期号:1 页码:57-63
摘要	[Background]In temperate deserts of China,Reaumuria soongarica is one of the dominant species. This study aim to explore the response of seed germination and emergence to precipitation patterns. Which would provide a scientific basis for further study of the response characteristics of typical desert plants under the background of global climate change. [Methods]The experiment,under artificial control conditions,were composed by two parts: 1) 2 water absorption and 4 drought time gradients,2) 5 precipitation gradients and 6 precipitation frequencies. [Results]1) The seed germination of R. soongarica was significantly affected by the duration of drought (P < 0.01). Compared with the control, the germination rate of R. soongarica seeds with water absorption (1 d or 2 d) was significantly increased after short-term drought (1 d,2 d and 4 d). The germination rate would decrease after a long-term drought (8 d). 2) Seedling emergence of R. soongarica was significantly affected by precipitation quantity and precipitation frequency (P < 0.01). The emergence rate was increased with the increase of precipitation frequency. When the precipitation rate quantity is 30 times/month and precipitation frequency is 100 mm, the emergence rate is the highest. 3) The length of radicle and the duration of drought had significant effects on the ability of seedlings to regain growth after rewatering (P < 0.01). The ability of seedlings to regain growth after rewatering decreased with the increase of radicle length before drought. Under the same radicle length,prolonging the drought time will reduce the ability of seedlings to resume growth after rehydration. [Conclusions]The optimal precipitation of R. soongarica seedlings is 100 mm,and the best precipitation frequency is 30 times/month. The changes of precipitation quantity and precipitation frequency caused by climate change will significantly affect the regeneration of R. soongarica seedlings.
其他摘要	研究红砂(Reaumuria soongarica)种子萌发和出苗对降水变化的响应特征,可为进一步研究全球气候变化背景下典型荒漠植物的响应特征提供科学依据。在人工控制条件下,设置2个吸水梯度、4个干旱时间梯度、5个降水量梯度和6个降水频率进行模拟试验,研究种子萌发和出苗对水分变化的响应。结果表明: 1)红砂种子萌发受干旱持续时间的影响显著(P < 0.01),相比对照,吸水(1 d或2 d)的红砂种子通过短期干旱(1 d、2 d和4 d)处理后发芽率显著升高,而长期干旱(8 d)处理后发芽率降低; 2)红砂种子出苗受降水量、降水频率的影响显著(P < 0.01)。出苗率随降水频率的增加而增大,降水量为100 mm,降水频率为30次/月时出苗率最大; 3)干旱前胚根长度和干旱持续时间对复水后幼苗恢复生长能力有显著影响(P < 0.01),复水后幼苗恢复生长的能力随干旱前胚根长度的增加而减弱,相同胚根长度下,延长干旱时间会减弱复水后幼苗恢复生长的能力。红砂幼苗出苗最适年总降水量为100 mm、降水频率为30次/月,气候变化引起的降水量和降水频率变化会显著影响红砂幼苗的更新。
关键词	降水红砂种子萌发出苗幼苗生长 precipitation Reaumuria soongarica seed germination emergence seedling growth
收录类别	CSCD
语种	中文
WOS关键词	Plant Sciences
WOS研究方向	Science & Technology
WOS类目	PLANT SCIENCES
CSCD记录号	CSCD:6459678
引用统计
文献类型	期刊论文
专题	任务一_子任务一循证社会科学证据集成任务一
作者单位	1.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国 2.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国 3.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国 4.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国 5.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国 6.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	王珊,单立山,张正中,等. 降水变化对红砂种子萌发和出苗的影响[J]. 中国水土保持科学,2019,17(1):57-63.
APA	王珊,单立山,张正中,苏铭,李毅,&白蕾.(2019).降水变化对红砂种子萌发和出苗的影响.中国水土保持科学,17(1),57-63.
MLA	王珊,et al."降水变化对红砂种子萌发和出苗的影响".中国水土保持科学 17.1(2019):57-63.