Soil properties and nitrogen utilization of hinoki cypress under different climatic conditions in Shikoku Island and Kinki District of Japan
Soil properties and nitrogen utilization of hinoki cypress under different climatic conditions in Shikoku Island and Kinki District of Japan
复制标题
日本四国岛及近畿地区不同气候条件下扁柏土壤性质及氮素利用
DOI：
10.1007/s10310-011-0271-8
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发表时间：
2011
影响因子：
1.5
通讯作者：
Fukata H
中科院分区：
文献类型：
--
作者：
Inagaki Y;Nakanishi A;Fukata H
以日本四国和近畿地区的扁柏林为研究对象，研究了气候条件和强烈间伐对土壤有机层、表层土壤和植物氮、水利用的影响。在高知县、爱媛县、香川县和京都县选择了35个森林。年平均气温为9.6 ~ 16.3°C，年平均降水量为1，350 ~ 3，960 mm，有机层碳、氮含量随年平均降水量的增加而降低。在降水量大的地区，有机层中的碳和氮含量会较低，这是由于土壤酸度低，分解速度快，以及由于强降雨造成的凋落物流失。0- 5cm表层土壤碳、氮含量随年平均气温的升高而降低，但与年平均降水量无关。结果表明，在高降水区，雨滴对有机层的损失导致植物氮素有效性降低。强烈间伐显著降低了有机层碳、氮含量，但对叶片氮含量和δ 13 C没有影响。这些结果表明，气候条件和强烈的间伐可以影响有机层中的碳和氮含量，并随后在土壤中的氮的有效性，但强烈的间伐并没有明显影响的氮和水的利用扁柏。
The effect of climate conditions and strong thinning on the soil organic layer, surface soil, and nitrogen and water utilization by plants was evaluated for hinoki cypress forests in Shikoku and Kinki districts in Japan. Thirty-five forests were selected in Kochi, Ehime, Kagawa and Kyoto prefectures. The mean annual temperate of the studied forests ranged from 9.6 to 16.3°C, and the mean annual precipitation ranged from 1,350 to 3,960 mm. Carbon and nitrogen content in the organic layer decreased with increasing mean annual precipitation. In high precipitation areas, carbon and nitrogen content in the organic layer would be lower due to rapid decomposition with low soil acidity and due to loss of litter because of heavy rainfall. Carbon and nitrogen content in the surface soil at 0–5 cm depth decreased with increasing mean annual temperature, but was not related to mean annual precipitation. The results indicate that loss of organic layer by raindrops in a high precipitation area causes lower nitrogen availability for plants. Strong thinning significantly reduced carbon and nitrogen content in the organic layer but did not affect nitrogen concentration and δ13C in leaves. These results suggest that climate conditions and strong thinning can affect carbon and nitrogen content in the organic layer and subsequent nitrogen availability in soil, but strong thinning does not appreciably affect nitrogen and water utilization by hinoki cypress.