基于遥感影像的江西省典型亚热带常绿阔叶林碳储量的估测研究

发布时间：2018-04-21 11:41

本文选题：碳储量 + 碳密度　；参考：《南昌航空大学》2017年硕士论文

【摘要】：江西省亚热带常绿阔叶林碳库是江西省森林碳库的重要组成部分,在江西省和全国森林碳库中占有重要的比重。本文以江西省三种典型的亚热带常绿阔叶林(木荷林、青冈栎林和苦槠栲林)为研究对象,采用实地调查结合遥感估算的方法,调查了九连山、井冈山、大岗山三个自然保护区内木荷林、青冈栎林和苦槠栲林标准样地碳储量相关因子,计算了标准样地的植被和土壤碳储量及其碳密度;建立了植被指数遥感估算模型,估算了江西省亚热带常绿阔叶林的植被和土壤碳储量及其碳密度;利用1985-2015年江西省的遥感影像数据,分析了近30年来间江西省亚热带常绿阔叶林植被和土壤碳储量及其碳密度的时序变化,在此基础上预测了未来20年江西省亚热带常绿阔叶林植被和土壤碳储量的变化趋势;并分析了江西省亚热带常绿阔叶林森林碳储量和碳密度的影响因子。结果如下:(1)标准样地的植被层中,不同的组织器官含碳率不同,乔木层表现为叶(50.14%)枝(48.50%)干(48.20%)根(47.55%);灌木层为叶(48.23%)枝(47.72%)根(47.12%);草本层为根(42.87%)叶(41.98%);凋落层的含碳率为42.36%。(2)标准样地的土壤层中,随着深度(0-100cm)的增加,土壤容重有增加的趋势,土壤有机碳含量有降低的趋势,不同深度土壤层的土壤容重分别为1.1290 g/cm3(0-10cm),1.2154 g/cm3(10-20cm),1.2507 g/cm3(20-30cm),1.2788g/cm3(30-50cm),1.2938g/cm3(50-100cm);不同深度土壤层的有机碳含量分别为3.5%(0-10cm),2.47%(10-20cm),1.9%(20-30cm),1.63%(30-50cm),1.14%(50-100cm)。(3)标准样地的植被碳储量从1.160t到22.762t,均值为7.591t,各植被层的碳储量均值分别为乔木层7.106t、灌木层0.212t、草本层0.093t、凋落层0.180t;植被碳密度从12.89 t/hm2到252.92 t/hm2,均值为84.31t/hm2,各植被层的碳密度均值分别为乔木层78.96 t/hm2、灌木层2.34 t/hm2、草本层1.04 t/hm2、凋落层1.97 t/hm2。(4)标准样地的土壤碳储量从7.08t到34.22t,均值为17.18t,各士层0-10cm、10-20cm、20-30cm、30-50cm、50-100cm碳储量均值分别为3.62t、2.68t、2.10t、3.61t、5.18t;土壤碳密度从78.61 t/hm2到380.25 t/hm2,均值为190.84 t/hm2,各土层0-10cm、10-20cm、20-30cm、30-50cm、50-100cm的碳密度均值分别为40.19t/hm2、29.78t/hm2、23.29t/hm2、40.06t/hm2、57.53t/hm2。(5)通过模型构建与检验分析,植被和土壤碳储量的NDVI模型优于RVI模型;利用NDVI模型估算了江西省1985-2015年的亚热带常绿阔叶林植被碳储量和土壤碳储量及其碳密度。在1985-2015年间,植被碳储量由0.1254GtC增加到0.2092GtC,植被碳密度由61.07 t/hm2增加到76.31 t/hm2;土壤碳储量由0.3820GtC增加到0.5474GtC,土壤碳密度由185.99 t/hm2增加到199.69 t/hm2;并对未来20年的江西省亚热带常绿阔叶林植被碳储量和土壤碳储量进行了预测,植被碳储量和土壤碳储量呈现增加的趋势。(6)论文最后分析了影响江西省亚热带常绿阔叶林植被和土壤碳储量的地理、气象和生物因子。植被碳密度和经度有显著相关性,土壤碳密度和纬度、坡度有相关性;植被碳密度与气温、降雨量和日照时长的变化趋势是一致的;土壤碳密度与气温的变化趋势是一致的,与和降雨量和日照时长的变化趋势不一致;随着林龄的增加,植被碳储量积累持续增加;乔木层碳储量对植被碳储量影响最大。
[Abstract]:The carbon pool of the subtropical evergreen broad-leaved forest in Jiangxi province is an important part of the forest carbon pool in Jiangxi province. It occupies an important proportion in the Jiangxi province and the national forest carbon pool. In this paper, three typical subtropical evergreen broad-leaved forests in Jiangxi province (wood charge forest, green oak forest and Castanopsis Castanopsis forest) are studied by field investigation and remote sensing estimation. The standard land carbon storage related factors in nine Lianshan, Jinggangshan, Dagangshan and Dagangshan three natural reserves, green oak forest and Castanopsis Castanopsis forest were investigated. The vegetation and soil carbon storage and carbon density of the standard plots were calculated, and the vegetation index estimation model was established, and the vegetation and soil of the subtropical evergreen broad-leaved forest in Jiangxi province were estimated. In the last 30 years, the vegetation of the subtropical evergreen broad-leaved forest and the change of carbon density in the subtropical evergreen broad-leaved forest in Jiangxi province were analyzed by using the remote sensing image data of 1985-2015 years in Jiangxi province. On this basis, the variation trend of vegetation and soil carbon reserves in the subtropical evergreen broad-leaved forest in Jiangxi province was predicted. The influence factors of carbon storage and carbon density in the forest of subtropical evergreen broad-leaved forest in Jiangxi province were analyzed. The results are as follows: (1) in the vegetation layer of the standard plots, the carbon content of different tissues and organs is different, the tree layer shows (50.14%) branches (48.50%) dry (48.20%) root (47.55%), the shrub layer is (48.23%) branch (47.72%) root (47.12%), and the herb layer is root (42.87%). Leaf (41.98%); in the soil layer with the carbon rate of 42.36%. (2), the soil bulk density increased with the increase of the depth (0-100cm), the soil organic carbon content decreased, the soil bulk density in different depth soil layers was 1.1290 g/cm3 (0-10cm), 1.2154 g/cm3 (10-20cm), 1.2507 g/cm3 (20-30cm), 1.2788g/cm3 (3). 0-50cm), 1.2938g/cm3 (50-100cm); the organic carbon content of soil layers in different depths were 3.5% (0-10cm), 2.47% (10-20cm), 1.9% (20-30cm), 1.63% (30-50cm), 1.14% (50-100cm). (3) the carbon reserves of the vegetation from 1.160t to 22.762t were from 1.160t to 22.762t, and the average carbon reserves of each vegetation layer were respectively arbor layer 7.106t, shrub layer, herb, and herb. Layer 0.093t, litter 0.180t, the carbon density of vegetation from 12.89 t/hm2 to 252.92 t/hm2, mean value 84.31t/hm2, the average carbon density of each vegetation layer is 78.96 t/hm2 in tree layer, 2.34 t/hm2 in shrub layer, 1.04 t/hm2 in herbaceous layer and 1.97 t/hm2. (4) in litter layer from 7.08t to 34.22t, mean value is 17.18t, each layer 10-20, 10-20. The carbon reserves of CM, 20-30cm, 30-50cm and 50-100cm are 3.62t, 2.68t, 2.10t, 3.61t, 5.18t, and the soil carbon density is from 78.61 t/hm2 to 380.25 t/hm2, and the mean value is 190.84 t/hm2. The NDVI model of vegetation and soil carbon reserves is superior to the RVI model, and the carbon reserves and carbon storage and carbon density of the vegetation in the subtropical evergreen broad-leaved forest in Jiangxi province for 1985-2015 years are estimated by NDVI model. In 1985-2015 years, the carbon reserves of vegetation are increased from 0.1254GtC to 0.2092GtC, and the carbon density of vegetation is increased from 61.07 t/hm2 to 76.31. T/hm2, the soil carbon reserves increased from 0.3820GtC to 0.5474GtC, the soil carbon density increased from 185.99 t/hm2 to 199.69 t/hm2, and the carbon reserves and soil carbon reserves of the subtropical evergreen broad-leaved forest in Jiangxi province in the next 20 years were predicted, and the carbon reserves and soil carbon reserves of the vegetation showed an increasing trend. (6) the paper finally analyzed the influence of the soil carbon reserves. The geographic, meteorological and biological factors of the vegetation and soil carbon reserves in the subtropical evergreen broad-leaved forest have significant correlation with the vegetation carbon density and longitude, and the soil carbon density is correlated with the latitudes and latitudes, and the carbon density of the vegetation is consistent with the temperature, rainfall and sunshine duration, and the soil carbon density is consistent with the change trend of the temperature. With the increase of rainfall and sunshine duration, the accumulation of carbon reserves in vegetation increases with the increase of forest age, and the carbon reserves of the tree layer have the greatest impact on the carbon reserves of vegetation.

【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S718.5

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