Spatial Distribution of Ancient Trees and Effects of Land Use Change in Yubei District,Chongqing

doi:10.13466/j.cnki.lyzygl.2022.01.019

Abstract

Abstract:

The purpose of this study was to explore the species composition,individual number,source,age structure and distribution of ancient trees in Yubei District of Chongqing,and the impact of land use type change on ancient trees,so as to highlight the value of ancient trees in inheriting history and culture,improve urban environment and protect regional biodiversity. Based on the existing data of ancient trees,this study conducted a field survey of ancient trees in Yubei District from March to June in 2021,and supplemented some data. Excel,ArcGIS,Spss Statistics 25 and other software were used to analyze the grade,family,species composition and growth of ancient trees in Yubei District. The spatial distribution characteristics were summarized,and the land use types were divided in Yubei District. The change of land use types was studied,and the influence of land use type change on ancient trees was revealed. The results showed that the rapid urbanization made the ancient trees face the problems of habitat deterioration and narrow growth and development space,and most of the preserved ancient trees in the highly urbanized area were the trees with strong adaptability. On this basis,the targeted conservation strategies of ancient trees were put forward.

Key words: Yubei District, ancient trees, spatial distribution, land use type, protection countermeasures

CLC Number:

S788

YANG Qiong, LIN Zhiyuan, DING Pengfei, LIU Gangming, WANG Haiyang. Spatial Distribution of Ancient Trees and Effects of Land Use Change in Yubei District,Chongqing[J]. FOREST RESOURCES WANAGEMENT, 2022, (1): 157-165.

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科名	属名	种名	株数/株
柏木科Cupressaceae	柏木属Cupressus	柏木Cupressus funebris Endl.	2
苏铁科Cycadaceae	苏铁属Cycas	苏铁Cycas revoluta Thunb.	4
银杏科Ginkgoaceae	银杏属Ginkgo	银杏Ginkgo biloba L.	12
千屈菜科Lythraceae	紫薇属Lagerstroemia	川黔紫薇Lagerstroemia excelsa(Dode)Chun	2
豆科Leguminosae	刺槐属Robinia	刺槐Robinia pseudoacacia	3
	红豆属Ormosia	红豆树Ormosia hosiei Hemsl.et Wils.	1
	皂荚属Gleditsia	皂荚Gleditsia sinensis Lam.	12
金缕梅科Hamamelidaceae	枫香树属Liquidambar	枫香树Liquidambar formosana	2
樟科Lauraceae	山胡椒属Lindera	黑壳楠Lindera megaphylla Hemsl.	1
	樟属Cinnamomum	樟Cinnamomum camphora(L.)presl	1
	楠属Phoebe	桢楠Phoebe zhennan S.Lee	5
桑科Moraceae	桑属Morus	蒙桑Morus mongolica Schneid.	1
	榕属Ficus	黄葛树Ficus virens Ait.var.sublanceolata(Miq.)Corner	206
		榕树Ficus microcarpa	5
马鞭草科Verbenaceae	牡荆属Vitex	黄荆Vitex negundo L.	1
黄杨科Buxaceae	黄杨属Buxus	黄杨Buxus sinica(Rehd.et Wils.)Cheng	1
榆科Ulmaceae	朴属Celtis	朴树Celtis sinensis Pers.	1
无患子科Sapindaceae	栾树属Koelreuteria	复羽叶栾树Koelreuteria paniculata Laxm.	2
漆树科Anacardiaceae	南酸枣属Choerospondias	南酸枣Choerospondias axillaris(Roxb.)Burtt et Hill.	1
柿科Ebenaceae	柿属Diospyros	柿Diospyros kaki Thunb.	1

来源	种数/株	占总种数/%	株数/株	占总株数/%
国外引进	1	4.76	3	1.14
国内引进	4	23.81	22	8.33
乡土植物	15	71.43	239	90.53
合计	20	100.00	264	100.00

分级	健康程度	对应特征
Ⅰ	正常	古树树形完好,枝叶繁茂,冠幅饱满,无枝梢枯损,新叶萌发明显,无病虫害
Ⅱ	衰弱	古树树形不完整或倾斜、倾倒,枝干有缺损或枝叶稀疏,冠幅较小,有病虫害,植株长势衰弱
Ⅲ	濒危	古树树形较差或植株倒伏,枝干枯损严重,病虫害较多,植株生长停滞,濒临死亡

土地利用类型		释义	人为干扰强度
林地		生长乔木、灌木、竹类的土地,包括山林、城镇绿化用地等	弱
耕地		种植农作物的土地,或以种植农作物为主,间有零星果树或其他树木的土地,包括水田、旱田	较弱
住宅用地		主要用于人们生活居住的房基地及其附属设施的的土地,包括城镇住宅用地与农村宅基地	强
道路		用于运输通行的地面线路,包括公路用地、城镇村道路用地以及农村道路	强
公共管理与公共服务用地	公园	城镇和村庄中的各类公园	强
	学校	各类教育用地及其附属设施用地	较强
	政府	各级党政机关及其附属用地	强