东北林业大学学报
東北林業大學學報
동북임업대학학보
JOURNAL OF NORTHEAST FORESTRY UNIVERSITY
2014年
11期
153-157
,共5页
多尺度%森林面积%森林资源清查%森林资源规划设计调查
多呎度%森林麵積%森林資源清查%森林資源規劃設計調查
다척도%삼림면적%삼림자원청사%삼림자원규화설계조사
Multi-scale%Area of forest%National forest inventory%Forest resource inventory planning and design
研究一类调查与二类调查的差异,分析现有森林资源样地调查方式的效率和误差,对比分析调整样地数量和样地面积大小后对市级区域森林面积估算的精度。以鞍山市为研究区,以二类调查小班数据为基础,以现行4 km×8 km样地间隔的标准样地数量为最大样本量,分析了在样方边长分别为25、30、250 m,1、2、3、4 km与样地数量分别为现行数量的1/2、1/3、1/4和1/5等情况下样地估算森林面积总体的精度。结果表明:样地面积越大,像元的混合度越大;现行抽样方式精度较高,误差仅为0.65%;当样地数量为现有样地数量的1/2,样地大小为2 km×2 km时,是较为准确估算鞍山市森林面积值的最佳抽样方式,误差为02.9%;虽然采样率为1/3,边长为3 km和4 km方式的精度更高,但是调查的面积更大。
研究一類調查與二類調查的差異,分析現有森林資源樣地調查方式的效率和誤差,對比分析調整樣地數量和樣地麵積大小後對市級區域森林麵積估算的精度。以鞍山市為研究區,以二類調查小班數據為基礎,以現行4 km×8 km樣地間隔的標準樣地數量為最大樣本量,分析瞭在樣方邊長分彆為25、30、250 m,1、2、3、4 km與樣地數量分彆為現行數量的1/2、1/3、1/4和1/5等情況下樣地估算森林麵積總體的精度。結果錶明:樣地麵積越大,像元的混閤度越大;現行抽樣方式精度較高,誤差僅為0.65%;噹樣地數量為現有樣地數量的1/2,樣地大小為2 km×2 km時,是較為準確估算鞍山市森林麵積值的最佳抽樣方式,誤差為02.9%;雖然採樣率為1/3,邊長為3 km和4 km方式的精度更高,但是調查的麵積更大。
연구일류조사여이류조사적차이,분석현유삼림자원양지조사방식적효솔화오차,대비분석조정양지수량화양지면적대소후대시급구역삼림면적고산적정도。이안산시위연구구,이이류조사소반수거위기출,이현행4 km×8 km양지간격적표준양지수량위최대양본량,분석료재양방변장분별위25、30、250 m,1、2、3、4 km여양지수량분별위현행수량적1/2、1/3、1/4화1/5등정황하양지고산삼림면적총체적정도。결과표명:양지면적월대,상원적혼합도월대;현행추양방식정도교고,오차부위0.65%;당양지수량위현유양지수량적1/2,양지대소위2 km×2 km시,시교위준학고산안산시삼림면적치적최가추양방식,오차위02.9%;수연채양솔위1/3,변장위3 km화4 km방식적정도경고,단시조사적면적경대。
We studied the differences between two types of surveys, efficiency and error analysis of an existing sample-plot sur-vey method, and the accuracy of the comparative analysis of municipal estimation after adjusting the number and area of sample-plots.We took Anshan as the study area, subcompartment data as reference, and the current 4 km×8 km interval standard plot-samples as the largest sample size.Then, we changed the quadrats side length from 25 m, 30 m, 250 m, 1 km, 2 km, 3 km to 4 km and the number of sample-plots from 1/2, 1/3, 1/4 to 1/5 of the current number. Finally, we estimated the accuracy of the overall.The larger of the plot area was, the greater of the pixel mixedness was.The accuracy of existing sampling was higher with the error of 0.65%. When the number of sample-plots reached the half of the existing sample number, the size of the plot was 2 km×2 km, the estimation of the forest area ratio in Anshan was best, and the er-ror was 0.29%.When the sampling rate was 1/3, the side lengths were 3 km and 4 km with higher accuracy, but with lar-ger investigation area.