Landscape Dynam ics of Rocky Desertif ica ted Lands in KarstMounta inousReg ion of North Guangdong in Recen t 30 Years

ZHANG Su-hong; LI Sen; WANG Jin-hua; HAO Jun-min; WU Bo

Based on remote sensing images in Karst area of north Guangdong in 1974, 1988 and 2004 and the fieldinvestigation, three landscape map s of the Karstmountainous region in north Guangdong were p roduced. In recent30 years, the rocky desertification in north Guangdong is experiencing a reverse p rocess. The area of rockydesertification lands in 1974 was 2 042. 43 km2 , covering 42. 47% of the Karst region in study area. In 1988 and2004, the ratios of rocky desertification lands reduced to 33. 95% and 21. 14% respectively. Slight rockydesertification land had the fastest decrease speed in the past 30 years among the different degradation degrees ofrocky desertification lands, and in 2004 the moderate rocky desertification land appeared to have the largestp roportion. The landscape heterogeneity of Karst region dep ressed continuously, and the landscape connectivityenhanced. The patch density of rocky desertification lands increased but the mean patch area decreased. The area ofpatches of rocky desertification lands has tended to be even.

1. Research Institute of Forestry, CAF

2. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing　100091, China

3. Institute of Resource and Environment Science, Foshan University, Foshan　528000, Guangdong, China

Received Date: 2008-02-27

Abstract: Based on remote sensing images in Karst area of north Guangdong in 1974, 1988 and 2004 and the fieldinvestigation, three landscape map s of the Karstmountainous region in north Guangdong were p roduced. In recent30 years, the rocky desertification in north Guangdong is experiencing a reverse p rocess. The area of rockydesertification lands in 1974 was 2 042. 43 km2 , covering 42. 47% of the Karst region in study area. In 1988 and2004, the ratios of rocky desertification lands reduced to 33. 95% and 21. 14% respectively. Slight rockydesertification land had the fastest decrease speed in the past 30 years among the different degradation degrees ofrocky desertification lands, and in 2004 the moderate rocky desertification land appeared to have the largestp roportion. The landscape heterogeneity of Karst region dep ressed continuously, and the landscape connectivityenhanced. The patch density of rocky desertification lands increased but the mean patch area decreased. The area ofpatches of rocky desertification lands has tended to be even.

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Landscape Dynam ics of Rocky Desertif ica ted Lands in KarstMounta inousReg ion of North Guangdong in Recen t 30 Years

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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