基于碳汇生产理念下县南沟流域农用地生态适宜性评价

发布时间：2018-01-16 00:31

本文关键词：基于碳汇生产理念下县南沟流域农用地生态适宜性评价　出处：《西北农林科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：退耕还林工程实施以来,特别是在CDM机制与理念融入之后,县南沟流域的农用地是否具有开展清洁发展机制的潜力,我们并不是很清楚,这直接影响了下一步农业生态经济可持续发展方案的制定和实施。基于此,必须先明确该流域农用地的生态适宜性。为此,我们运用GIS技术,通过矢量化、叠加分析和空间分析等方法的应用,获得农用地土地类型数据,对其生态适宜性进行分类,然后测算农用地的碳汇潜力和碳汇价值,明确县南沟流域农用地生态适宜性,为农用地利用结构的调整指明方向,从而确定该流域的农用地是否具有开展清洁发展机制的潜力。主要结论如下:1、县南沟流域共有宜耕农用地175.37 hm2,宜园农用地333.82 hm2,既宜耕又宜园的农用地291.59 hm2,宜林农用地3203.85 hm2,宜草农用地829.17 hm2。与现有的土地利用状况相比,耕地、园地和草地基本都处于适宜其各自生长的区域,适宜程度较高,而林地的分布存在一定的不合理性,其中有32.28%刺槐林处于勉强适宜的种植区域,然而该流域还有大面积的宜林地未被充分利用,目前多以荒草地的形式存在,由此可以看出,该流域林、草地的利用状况还有待进一步的调整缩减草地面积,合理的加大刺槐林的面积。而在碳汇生产的理念下,林地的碳汇效果一般都优于草地,这说明该流域的农用地在生态适宜性上可以达到更加低碳的效果。2、在县南沟流域农用地方式目前的利用下,林地、草地、耕地和园地的年均净固碳能力分别为2.87t/hm2、1.54 t/hm2、2.45t/hm2和0.69t/hm2,由此可以看出,该流域农用地的净固碳能力为林地耕地草地园地。而在生态适宜性评价后,林地的面积和适宜性程度都发生了较大的改变,其净固碳能力也增长为3.11t/hm2,从而引起县南沟流域总碳汇量的大幅增加,由此说明,刺槐林的分布状况和适宜性程度在很大程度上决定着该流域农用地的总固碳能力。3、目前,县南沟流域农用地的年均固碳总量为9838.245t,而经过生态适宜性调整土地利用结构后,其年均固碳总量可增长至12806.09t,比现阶段年均总固碳量增长30.17%。而碳汇的潜在交易价值也由原来的295147.35元增长至384183.48元,同比增长89036.13元,涨幅达30.17%。所以县南沟流域的农用地具有较大的碳汇生产的适宜性。
[Abstract]:Since the implementation of the project, especially after the integration of CDM mechanism and concept, it is not clear whether the agricultural land in Nangou watershed has the potential to develop clean development mechanism. This directly affects the formulation and implementation of the next agricultural eco-economic sustainable development program. Based on this, we must first determine the ecological suitability of agricultural land in this basin. Therefore, we use GIS technology, through vectorization. With the application of superposition analysis and spatial analysis, the land type data of agricultural land were obtained, the ecological suitability of agricultural land was classified, and the carbon sequestration potential and carbon sequestration value of agricultural land were calculated. The ecological suitability of agricultural land in Nangou watershed of county was clarified, and the direction of adjustment of agricultural land use structure was pointed out, so as to determine whether the agricultural land in this basin had the potential of developing clean development mechanism. The main conclusion is as follows: 1. A total of 175.37 hm-2, 333.82 hm-2, and 291.59 hm2 of arable land and garden land were found in Nangou watershed. The agricultural land in Yilin was 3203.85 hm2and the grassy land was 829.17hm2.Compared with the existing land use condition, the cultivated land, garden land and grassland were basically in the suitable areas for their respective growth. The degree of suitability is high, and the distribution of forest land has some irrationality, of which 32.28% Robinia pseudoacacia forest is in the barely suitable planting area, but there is still a large area of suitable forest land in the basin has not been fully utilized. At present, most of the grassland exists in the form of wasteland, from which we can see that the utilization of forest and grassland in this watershed still needs to be further adjusted to reduce the grassland area. Reasonable increase of acreage of Robinia pseudoacacia forest. Under the concept of carbon sink production, the carbon sink effect of forest land is generally better than grassland, which shows that the agricultural land in this basin can achieve more low-carbon effect on ecological suitability. The average annual net carbon sequestration capacity of forestland, grassland, cultivated land and garden land was 2.87 t / hm ~ (2) 路hm ~ (2) / hm ~ (2) ~ (1.54) t / hm ~ (2), respectively. 2.45 t / hm ~ 2 and 0.69 t / hm ~ 2, it can be seen that the net carbon sequestration capacity of agricultural land in this basin is forestland, cultivated land, grassland garden, and after ecological suitability evaluation. The area and suitability of forest land have changed greatly, and its net carbon sequestration capacity has also increased to 3.11t / hm ~ 2, which caused a large increase in the total carbon sink of Nangou watershed. The distribution and suitability of Robinia pseudoacacia forest largely determine the total carbon sequestration capacity of agricultural land in this basin. At present, the annual carbon sequestration capacity of agricultural land in Nangou watershed is 9838.245 tons. After adjusting the land use structure by ecological suitability, the total carbon sequestration can increase to 12806.09t per year. Compared with the current annual total carbon sequestration increased 30.17 percent, and the potential trading value of carbon sinks also increased from the original 295147.35 yuan to 384183.48 yuan. The increase was 89036.13 yuan, a rise of 30.17 yuan. Therefore, the agricultural land in the Nangou watershed of county is suitable for the production of carbon sequestration.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S181;F323.211

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