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The Evaluation On Plant Resources Of Xinjiang

Posted on:2009-06-03Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z Y YuanFull Text:PDF
GTID:1100360245985750Subject:Physical geography
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The territory of Xinjiang is broad, the special natural condition brings up abundant and special plant resources, and these plant resources have important function to development construction and improvement ecosystem environment of Xinjiang.The forest resources area and quantity of Xinjiang are all keep low in average level in the whole country; Xinjiang belongs to the region where the forest resources are not rich. The foresty area and amount of growing stock are total to present up-rend. From the analysis of six types of forestries, it showed that the proportion of no woodland area has reached to 47.1%, The woodland area is 30.78%. In 2004, the proportion of woodland recovered to 37.4% and no comparison is 11.45%. See from the wood kinds, public-spirited wood's area of Xinjiang rises gradually and occupies very big proportion, the shelter forest which defends the breeze and solid sand is 90%. The area proportion of merchandise wood comparison lowers from 1984 to1993;It ascends during 1994-1998. Economic wood's proportion increases gradually; the material wood's proportion reduces gradually. Analysis the comparison of woodland and open forest land, the open forest land covers large area in naturel forest which grows in mountain or valley and artificial wood. The wood's age structure comparison is out of tune, the mature forest and overmature forest's area is eight times than young growth, the amount of growing stock is young growth respectivel twenty-five times and forty times.so the natural wood is lack.. It concluded that the indirectly worth is far larger than directly worthy the forest ecosystem system provide. The broad-leaved wood has very high value of keeping soil and defending the the breeze, soliding sand and decontaminatign environment, the coniferous forest has pride to intercept to retain water highly with decontamination fluid matter of value, it showed that each forest ecosystem value relates to the region where it is.There is broad natural lawn in Xinjiang; it is one of national important herding. Pasture offers production means and also has deep influence to the ecosystem environment. The lawn resources distributes asymmetry, lawn area of souther of Xinjiang is larger than the norther. The lawn area is decreasing during 1988-2000, but the production value of stockbreeding is increasing continuously at the same time. Explain from here, the growth of the stockbreeding of Xinjiang takes consuming the lawn resources as stake. The high coverge lawn in plain reduces the areas of middle and low coverge lawn change range greatly. In mountain, the areas of different coverge lawn change small. Xinjiang lawn ecosystem service change greatly, the value increases during 1988-1998, it decreases during 1999-2000. The highest value of Xinjiang lawn ecosystem service is 2.13×109yuan in 1998.There are 11 pasture types. The producibility and ecosystem service function of different lawn type have obvious differentiation. The service that each kind of lawn ecosystem system provides is worth row preface for: low mountain medow> temperate dessert> mountainous meadow> temperate grassland> paramos meadow> temperate dessertic grassland> temperate grasslandic dessert> temperate meadowic grassland> paramos grassland> marsh> paramos dessert.so the exploitation of lawn resources, combine each lawn type of the characteristics to carry on exploitation.There are enough light and temperature resources to satisfy the need for crop's growth, but the water resource is lack and fertiliazation of earth is uneven, these restrict the crop's production. The lower agricultural machinization is also a limit factor. The crop eco-system service value of 2005 is add 25% to 1988, li is 126.72×108yuan. The natural eco-system guards the crop ecosystem. We shoud protect the natural vegetation when we want to improve the production.The wilding resources of Xinjiang are abundant, distributing extensively, the quality is best. People dig the high valuable species crazily, it causes the vegetation broken, and the environment is depravity. Many wilding resources face extinct. Descend to go to thus, a lot of wildings will be dig almost exhausted, many plants species which haven't been made use of will also disappear quietly. Because research and production could not combine well,exploited species just be the original materials or semi-manufactured goods, the resources don't increase in value, so the plant resources of Xinjiang has very small comparison in the national economy. To sum it up, the wilding resources of Xinjiang has advantage to be developed in the depth, so we should converse the resources advantage to merchandise advantage when protecting the plant resources.According to ecological footprint, 1988-2005 years, the using of resource, 10000 dollars GDP, development coefficient ability, these data show that Xinjiang placed in unsustainable development currently and the using efficiency of resource is low. From 1988 to 1994, the per capita ecological footprint is smaller than the per capita bio-capacity, Xinjiang's development is sustainable. Per capita ecological footprint is larger than per capita bio-capacity, it showed that Xinjiang's development is unsustainable. The 10000 dollars GDP ecological footprint shows that the using efficiency of resources is low. We can solve this by using different kinds land to improve the ecological economy.The plant growth depends on water,.according to the ecologicalfootprint of water resources of Xinjiang ,the per capita water ecological footprint change steadily ,but the per capita water ecological footprint changs great because of distribution uneven. There is large ecological deficit, so when the plant resources will be explored, they should be allocated reasonable according to water resources.There exits three problems from the analysis two sides between the plant resources and society needs: (1) Xinjiang current economy's developing all is taking consuming plant resources as price. This kind of development mode makes renewable plant resources decreasing and hard to renewable; meantime the broken vegetation will bring the negative influence to ecosystem environment. But the plant resources reduced gradually apparently can't satisfy the need of society; (2) there have wasting and low using efficiency phenomenon in using resource process of Xinjiang. These potential development plant resources don't be known and take into exploitation; (3) the lack of water resource is the restrict factor to developing the plant resources. So according to de water resources, it is good way to install plant resources reasonable to exertive biggest performance.
Keywords/Search Tags:plant resources, evaluation, ecosystem service value, ecological footprint
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