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Element Budgets in a Forested Watershed in Southern China: Estimation of a Proton Budget |
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| Authors: | Yasunori Nakagawa Li Changhua Goro Iwatsubo |
| Institution: | 1. Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan 2. Commission for Integrated Survey of Natural Resource, The Chinese Academy of Sciences, Beijing, 100101, People Republic of China 3. Faculty of Agriculture, Kinki University, Nara, 631-8505, Japan |
| Abstract: | We evaluated the element budgets in a forested watershed in Jiulianshan, southern China. The element input in bulk precipitation was characterized by high depositions of H+, NH4 +, Ca2+, and SO4 2?, i.e., 400, 351, 299, and 876 eq/ha/yr, respectively. The outputs of H+, NH4 +, and SO4 2? from the watershed were very low, while those of Ca2+ and Mg2+ were high, 712 and 960 eq/ha/yr, respectively. The element budgets suggested that i) the net retentions of H+, NH4 +, and SO4 2? in this watershed were high, and ii) the net release of Mg2+ from this watershed was high mainly due to weathering. The net release of Ca2+ was not so high because of the high atmospheric deposition, while atmospheric deposition of Mg2+ was not so high (130 eq/ha/yr). Decrease of acid neutralizing capacity in the soil, i.e., net soil acidification, was caused mainly by the net release of Mg2+. Moreover, the net retention of SO4 2? also contributed to soil acidification. |
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