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Primary production and resource use efficiency in relation to resource acquisition in deciduous and coniferous forest ecosystems

落叶林和针叶林生态系统中与资源获取相关的初级生产和资源利用效率

基本信息

批准号：
17580127
负责人：
NAKANISHI Asami
金额：
$ 1.95万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

Changes in resource availability can affect nutrient use efficiency of plants. We investigated the effects of stand characteristics, soil nutrient availability, climatic condition and thinning on nitrogen use strategy in hinoki cypress stands. The study areas were Pacific side of Honshu (Kochi prefecture), Japan Sea side (northern region of Kyoto prefecture) and inland region (Kamigamo, Kyoto city) where climate conditions differ substantially; the means of annual temperature and mean annual precipitation in the stands ranged from 9.1 to 16.3℃ and from 1500 to 3300 mm, respectively. In each forest in Kochi and Kamigamo, we located two study plots: in one plot thinning was conducted and in the other plot no trees were cut as the control. We found the significant effects on nitrogen status of hinoki as following. Nitrogen resorption efficiency was larger in the thinned plots than in the control plots in the thinning experiments. The nitrogen concentration in the leaf litter was lower whe … More n solar radiation from Mardi to October was higher in Kochi forest for 13 years. The results suggest that nitrogen use efficiency (NUE) increases with increasing light availability. By contrast, nitrogen concentration in leaf-litter was not lower in forests with higher annual precipitation, suggesting that NUE does not increase with higher water availability. The time of 50 % annual leaf-fall was later in the warmer climatic condition. Leaf-litter N concentration was lower when leaf-fall occurred later. The results suggest that NUE increases when the climatic conditions are favorable. In addition, the effects of strong wind in typhoons on plants are greater in the stands at higher elevation. In these stands, the time of 50 % annual leaf-fall was earlier and hinoki trees shed their leaves with higher nitrogen concentration. The results indicate that NUE of hinoki cypress is closely related with leaf-fall phenology that is affected by temperature and typhoon. The results of the study suggest that the climatic condition as well as resource availability affects NUE of hinoki cypress. Less

资源可利用性的变化会影响植物的养分利用效率。研究了林分特征、土壤养分有效性、气候条件和间伐对扁柏林分氮肥利用策略的影响。研究区域为本州太平洋一侧（高知县）、日本海一侧（京都县北方地区）和内陆地区（京都市上贺茂），气候条件差异较大，林分年平均气温和年平均降水量分别为9.1 ~ 16.3℃和1500 ~ 3300 mm。在高知和上贺茂的每一片森林中，我们都有两个研究地块：一个地块进行了间伐，另一个地块没有砍伐树木作为对照。结果表明，施肥对扁柏氮素营养状况有显著影响。在间伐试验中，间伐区的氮素再吸收效率大于对照区。凋落叶中氮素浓度较低， ...更多信息高知森林13年中，从Mardi到10月的太阳辐射较高。结果表明，氮素利用效率（NUE）随着光照的增加而增加。相比之下，叶凋落物中的氮浓度并不低，在森林与较高的年降水量，这表明NUE不增加较高的水的可用性。在较暖的气候条件下，年落叶率达50%的时间较晚。落叶发生较晚，凋落叶氮浓度较低。结果表明，当气候条件有利时，NUE增加。此外，台风大风对海拔较高林分植物的影响较大。在这些林分中，扁柏树年落叶50%的时间较早，落叶的氮浓度较高。结果表明，扁柏的NUE与受温度和台风影响的落叶物候密切相关。研究结果表明，气候条件和资源可利用性影响着扁柏的NUE。少