Study on the Space-temporal Evolution Feature of the Rocky Desertification in Typical Karst Area of Eastern Yunnan

doi:10.13466/j.cnki.lyzygl.2019.02.015

Abstract

Abstract:

Rocky desertification is one of the three major problems of land degradation in southwest China,and has long been a focus issue in academic circle.Rocky desertification may lead to the decline of water conservation capacity of the top soil,water shortage and low land productivity,which helps to accelerate the process of regional poverty.Thus,the knowledge of its distributive characteristics and development trend is of great significance for our scientific understanding and control work.Based on the data of the remote sensing images in Shizong county in 1995,2005 and 2015 respectively,this paper gives an analysis of the regional space-time change of rocky desertification in the past two decades by using the method of the decision trees to extract the distribution data of rocky desertification (6 grades are included:zero,potential,light,moderate,intensive and high-intensive). The spatial and temporal dynamic model of rocky desertification and the transfer matrix are used.The study results are as follows:(1) On time dimension,there is a great reduction in the potential,light and moderate rocky desertification,also a reduction in the intensive and high-intensive rocky desertification,but in a small range.There are increases both in zero desertification and the dynamic degree of integrated rocky desertification.Besides,a significant change in the dynamic degree of potential and mild rocky desertification can be found.(2) On spatial dimension,the severely-stricken areas of rocky desertification are mainly distributed in the following towns:Longqing,Wulong and Zhuji.As some distinctive features in the spatial distribution pattern,rocky desertification in these regions covers a wide range and complete grades.Meanwhile,in the central part,it shows a weak distribution grade of the linked rocky desertification areas.In the western and eastern parts,it presents a character of continuous distribution in moderate,intensive as well as high-intensive rocky desertification.

Key words: rocky desertification, space-time change, dynamic degree, the transfer matrix, Karst area

CLC Number:

X171

ZHANG Ruijiao, ZHANG Chao, LU Shuangfei, ZHONG Enzhu. Study on the Space-temporal Evolution Feature of the Rocky Desertification in Typical Karst Area of Eastern Yunnan[J]. FOREST RESOURCES WANAGEMENT, 2019, (2): 99-108.

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等级	1995年		2005年		2015年
等级	面积/km²	占总土地面积/%	面积/km²	占总土地面积/%	面积/km²	占总土地面积/%
无石漠化	1749.8	62.91	1772.56	63.74	1900.03	68.32
潜在	111.02	4.00	106.6	3.83	50.30	1.81
轻度	48.49	1.74	91.58	3.29	30.83	1.11
中度	113.89	4.10	56.38	2.03	44.69	1.61
强度	30.25	1.09	26.49	0.95	27.84	1.00
极强度	4.53	0.16	4.37	0.16	4.29	0.15
非岩溶区	723.19	26.00	723.19	26.00	723.19	26.00
总和	2781.17	100.00	2781.17	100.00	2781.17	100.00

等级	面积/km²			1995—2005年		2005—2015年		1995—2015年
等级	1995	2005	2015	变化面积/km²	动态度/%	变化面积/km²	动态度/%	变化面积/km²	动态度/%
无石漠化	1749.80	1772.56	1900.03	22.76	0.13	127.47	0.72	150.23	0.43
潜在	111.02	106.60	50.30	-4.42	-0.40	-56.30	-5.28	-60.72	-2.73
轻度	48.49	91.58	30.83	43.09	8.89	-60.75	-6.63	-17.66	-1.82
中度	113.89	56.38	44.69	-57.51	-5.05	-11.69	-2.07	-69.20	-3.03
强度	30.25	26.49	27.84	-3.76	-1.24	1.35	0.51	-2.41	-0.40
极强度	4.53	4.37	4.29	-0.16	-0.35	-0.08	-0.18	-0.24	-0.26

1995—2005年			2005—2015年			1995—2015年
变化面积/km²	动态度/%		变化面积/km²	动态度/%		变化面积/km²		动态度/%
131.7	0.47		257.64	0.93		300.46		0.54

1995	2005
1995	无石漠化	潜在石漠化	轻度石漠化	中度石漠化	强度石漠化	极强度石漠化
无石漠化	1746.98	0.32	2.43	0.07	0	0
潜在石漠化	7.00	103.75	0.26	0.01	0	0
轻度石漠化	9.59	0.66	38.24	0	0	0
中度石漠化	6.72	0.67	50.55	55.95	0	0
强度石漠化	2.16	1.2	0.06	0.37	26.46	0
极强度石漠化	0.11	0	0.02	0	0.03	4.37

2005	2015
2005	无石漠化	潜在石漠化	轻度石漠化	中度石漠化	强度石漠化	极强度石漠化
无石漠化	1772.56	0	0	0	0	0
潜在石漠化	56.97	49.63	0	0	0	0
轻度石漠化	60.66	0.09	30.62	0	0.21	0
中度石漠化	9.58	0.58	0	44.07	1.7	0.45
强度石漠化	0.24	0	0.21	0.48	25.56	0
极强度石漠化	0.02	0	0	0.14	0.37	3.84