Element Budgets in a Forested Watershed in Southern China: Estimation of a Proton Budget
Source: Water, Air, and Soil Pollution, Volume 130, Numbers 1-4, August 2001 , pp. 715-720(6)
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^+, NH_4^+, Ca^2+, and SO_4^2−, i.e., 400, 351, 299, and 876 eq/ha/yr, respectively. The outputs of H^+, NH_4^+, and SO_4^2− from the watershed were very low, while those of Ca^2+ and Mg^2+ were high, 712 and 960 eq/ha/yr, respectively. The element budgets suggested that i) the net retentions of H^+, NH_4^+, and SO_4^2− in this watershed were high, and ii) the net release of Mg^2+ from this watershed was high mainly due to weathering. The net release of Ca^2+ was not so high because of the high atmospheric deposition, while atmospheric deposition of Mg^2+ 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 Mg^2+. Moreover, the net retention of SO_4^2− also contributed to soil acidification.
Document Type: Regular Paper
Affiliations: 1: Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan e-mail: email@example.com 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
Publication date: August 2001