This paper with the bush forest

needle leaf forest and rich leaf forest of Qilian mountains 3 kinds of forest land is research material

discuss the different type of forest land as soil reason melts

the influence of nature and the selfcontrol function of source of water

show as a result: Soil porosity

granule structure and physicalness glue grain content is bush forest > needle leaf forest > rich leaf forest

soil unit weight and physicalness sand grain content are bush forest < needle leaf forest < rich leaf forest;Soil organic matter

whole N

N of quick result

P of quick result

K of quick result and CEC is bush forest > needle leaf forest > rich leaf forest

and CaCO_3

pH

completely salt content is bush forest < needle leaf forest < rich leaf forest;Soil water layer thickness

natural water content

saturation reservoir storage and woollen pipe reservoir storage

not woollen pipe reservoir storage

store water quantity is bush forest > needle leaf forest > rich leaf forest;Withered fall thing accumulation thickness

withered fall thing accumulation dry quality

hold water quantity

biggest hold water rate is bush forest > needle leaf forest > rich leaf forest.Bush forest plant kind is rich

closing degree big

withered fall thing accumulation quantity much

the self-control function of source of water is strong.