Feng Teng, Chen Hong-song, Zhang Wei, Nie Yun-peng, Wang Ke-lin
Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
Ying Yong Sheng Tai Xue Bao. 2011 Mar;22(3):593-9.
This paper studied the profile distribution characters of 137Cs and soil organic carbon (SOC) on the Karst slopes and in the fissures in typical peak-cluster depression in Northwest Guangxi, aimed to approach the applicability of 137Cs method on Karst slopes and the implication of 37Cs for the characteristics of slope soil erosion. In all test profiles, there was a significant correlation between 137Cs and SOC, indicating that both of them might have the same loss pathway. On the slopes under secondary forests, 137Cs mainly existed within the depth 0-24 cm. On the upper middle and middle slope sites, 137Cs had an exponential decrease with depth, indicating no or slight surface erosion; while on the foot slope site, the distribution pattern of 137Cs indicated severer erosion. On the slopes with cultivated lands, 137Cs distributed uniformly within the plough layer. In the upper middle and middle slopes profiles, 137Cs mainly existed in the depth around 15 cm and far less than the background value, indicating severe soil erosion; while in foot slope profiles, 137Cs was aggraded to the depth 45 cm. A discontinuous distribution of 137Cs in the profiles was detected on the foot slopes under secondary forests, on the upper middle and foot slopes of cultivated lands, and in the fissures, indicating that the soil particles on Karst slopes had a trend of losing with rainwater to the underground, but the loss quantity was negligible, compared with surface erosion.
本文研究了桂西北典型峰丛洼地岩溶斜坡及裂隙中137Cs和土壤有机碳（SOC）的剖面分布特征，旨在探讨137Cs方法在岩溶斜坡上的适用性以及37Cs对斜坡土壤侵蚀特征的指示意义。在所有测试剖面中，137Cs与SOC之间存在显著相关性，表明它们可能具有相同的流失途径。在次生林下坡，137Cs主要存在于0 - 24 cm深度范围内。在中上坡和中坡部位，137Cs随深度呈指数下降，表明无或轻微的地表侵蚀；而在坡脚部位，137Cs的分布模式表明侵蚀较为严重。在有耕地的斜坡上，137Cs在耕层内分布均匀。在中上坡和中坡剖面中，137Cs主要存在于约15 cm深度处，且远低于背景值，表明土壤侵蚀严重；而在坡脚剖面中，137Cs累积至45 cm深度。在次生林下坡脚、耕地中上坡和坡脚以及裂隙中，剖面中检测到137Cs的不连续分布，表明岩溶斜坡上的土壤颗粒有随雨水流失到地下的趋势，但与地表侵蚀相比，流失量可忽略不计。
