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Transpiration surface reduction of Kousa Dogwood trees during serious water imbalance
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作者 王斐 山本晴彦 《Journal of Forestry Research》 SCIE CAS CSCD 2009年第4期337-342,I0006,共7页
The response of Kousa dogwood (Cornus kousa Buerg.) to extreme stresses was investigated by RGB image analysis in the hot, dry and windy summer in 2007 in Yamaguch, Japan. Results show that tip and margin leaf scorc... The response of Kousa dogwood (Cornus kousa Buerg.) to extreme stresses was investigated by RGB image analysis in the hot, dry and windy summer in 2007 in Yamaguch, Japan. Results show that tip and margin leaf scorch was observed on many Kousa dogwood trees and clearly dark brown defense barrier appeared on scorched leaves. The defense barrier withdrew back from distal to proximal gradually until successful control of scorching, and left a series of unsuccessful defense traces. By responsive analysis of leaf color homogeneity with RGB image analysis method, a sharp logistic equation was obtained for the relative green/luminance (RGL) value of scorched leaves. By the meteorological analysis, the occurrence of dogwood leaf scorch-back was almost synchronous with the aridity peak period. It sug- gested that during the sudden aridity increment the extreme water stresses induce the defense response of Kousa dogwood tree to shear the excessive transpiration leaf area, and prevent the rest of the trees from further water loss. Image pixet analysis showed that 40.2% leaf area of sampled dogwood trees was reduced through the partial leaf scorch-back by the end of August in 2007. In contrast, only 13.2% leaf area was reduced from the same trees in 2008, for the reason of sufficient precipitation during first half year. In any case, the Kousa dogwood trees indeed reduced their transpiration surface area and appeared a surface reduction pattern differing from those shedding leaves or withering all the aboveground. Based on desiccation process analysis, it is considered that the interaction of the leaf dried back and the self-defense response was the key of the transpiration surface reduction (TSR) of Kousa dogwood during sudden hot and droughty stresses. 展开更多
关键词 aridity peak kousa dogwood leaf scorch-back logistic responsive function relative G/L transpiration surface reduction
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四照花物种分布格局模拟及冰期避难所推测 被引量:20
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作者 管毕财 陈微 +3 位作者 刘想 蔡奇英 刘以珍 葛刚 《西北植物学报》 CAS CSCD 北大核心 2016年第12期2541-2547,共7页
气候是影响物种多样性的重要自然因素,同时也影响生物的生长发育及其分布。该文以广泛分布于中国的观花植物四照花为研究对象,通过植物标本库查询和野外实地调查确定四照花在中国的分布情况,利用MaxEnt模型和ArcGIS软件模拟四照花的历... 气候是影响物种多样性的重要自然因素,同时也影响生物的生长发育及其分布。该文以广泛分布于中国的观花植物四照花为研究对象,通过植物标本库查询和野外实地调查确定四照花在中国的分布情况,利用MaxEnt模型和ArcGIS软件模拟四照花的历史分布格局、当前分布格局及未来的分布趋势,计算不同时期物种分布面积的变化并分析物种分布变化产生的原因。研究结果显示:四照花当前的分布主要受降水量变异系数、最冷月份最低温、最冷季节平均温度和温度季节变化4个生物气候因子影响。此外,基于四照花在末次盛冰期、全新世中期和当前的分布格局的变化推测:冰期来临时,中西部的大巴山地区和东部天目山地区是四照花潜在分布的核心区,为四照花的冰期避难所。 展开更多
关键词 四照花 冰期避难所 物种分布模型 地理信息系统
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产于宁波的2种中国新记录植物
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作者 傅晓强 张幼法 +3 位作者 陈征海 李修鹏 杨紫峰 李根有 《浙江农林大学学报》 CAS CSCD 北大核心 2015年第6期990-992,共3页
报道了发现于浙江省宁波市的2种中国新记录植物,分别为芸香科Rutaceae的日本花椒Zanthoxylum piperitum(L.)DC.和山茱萸科Cornaceae的东瀛四照花Cornus kousa Buerg.ex Hance。
关键词 植物学 分布新记录 日本花椒 东瀛四照花 宁波 中国
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舟山群岛2种中国新记录植物 被引量:1
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作者 高浩杰 《西北植物学报》 CAS CSCD 北大核心 2015年第12期2552-2554,共3页
报道了发现于浙江舟山群岛的2种中国分布新记录植物,分别是芸香科(Rutaceae)的日本花椒[Zanthoxylum piperitum(L.)DC.]和山茱萸科(Cornaceae)的日本四照花(Cornus kousa subsp.kousa F.Buerger ex Hance),并提供了形态描述与图片。凭... 报道了发现于浙江舟山群岛的2种中国分布新记录植物,分别是芸香科(Rutaceae)的日本花椒[Zanthoxylum piperitum(L.)DC.]和山茱萸科(Cornaceae)的日本四照花(Cornus kousa subsp.kousa F.Buerger ex Hance),并提供了形态描述与图片。凭证标本存于浙江农林大学植物标本馆(ZJFC)。 展开更多
关键词 日本花椒 日本四照花 新记录 浙江 中国
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