摘要
KDN是一种GEOL-ECOL灾难,是发生潮湿的碳酸盐岩区的土壤侵蚀、土地退化与生态系统凋萎,致使人类很难生活在其中。KDN是我国四大GEOL-ECOL灾难中最难整治、最难摆脱贫困的地区。 本文按国际公认的原则为准,认定“石山化”≠KDN,从地质结构性气候、物候和生态系统多因子厘定了KDN术语,认定人为扰动与人口超载是其产生的序参量。其过程最迟也是300多年前明清朝代屯垦开始,近半个世纪加速衰竭,森林被毁、野生生物消亡、土地退化随时序而不可逆,进而危及人类生存,不少山民在温饱线上挣扎,SEE滞后发展,形成了最大的环境问题。 KDN的灾难损失是无形的,没法评估。对于KDD则可按四级进行评价:
KDNCkarst desertification)is a geological-ecological disaster because of soil erosion of carbonate terrain in wet climate zone. In KDN region,ecosystems are at a low ebb and have withered. In such environment human lives will be very hard.
In China exist four geological-ecological areas (large areas) : north west sand desert, Hubei, Shannxi, Gansu, Ningxia and Shanxi loess, southwest laterite, and southwest karst. KDCkarst desert)is the most difficult to control.
In the paper,according to international knowledge,I think'stone-fication' (soil hill to change into stone hill)is not KDN(karst desertification). By means of region climate, geological structure, bio-climate and ecosystem,I conclude that the original factors of KDN are human action and population overload.
In southwest China,KDN process has lasted 300 years. In these regions SEE (social ,economic,environmental.klevelopment became very slow.
KDD(karst desert disaster)may be according to 4 group classifications;
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1995年第3期137-147,共11页
Marine Geology & Quaternary Geology
基金
国家自然科学基金项目(49361002)
关键词
喀斯特
荒漠化
灾难
地质
生态
karst desertification disaster assessment
