【摘要】：選取西藏高原北部那曲地區(qū)一處典型的高寒草甸生態(tài)系統(tǒng)為研究對象,用TDR 300測量樣地中2個樣帶共82個測點表層0~7.5 cm的土壤含水率,在2015年生長季中共測量14次�；谒鶞y數(shù)據(jù)分析了土壤含水率的時空變異性和時間穩(wěn)定性。結(jié)果表明,2015年生長季2個樣帶表層平均土壤含水率為26.0%,在空間上表現(xiàn)為弱變異性,在時間上表現(xiàn)為中等變異性,土壤含水率較高時,土壤水分的變異性也較高;82個測點土壤含水率的空間模式在7月份—8月初相似性較弱,在8月中旬—9月初相似性較強;土壤含水率的相對差分平均值在-11.5%~8.5%之間,相對差分標準差的平均值為8.6%,二者表現(xiàn)為開口向上的二次曲線關(guān)系,說明土壤含水率接近樣地平均值的測點具有較高的時間穩(wěn)定性,而在較干和較濕的測點,土壤含水率的時間穩(wěn)定性相對較弱;時間穩(wěn)定性指數(shù)、平均絕對偏差、均方根誤差和最小相對差分標準差平衡法4種方法均能準確地判定土壤含水率時間穩(wěn)定性最佳代表測點,利用最佳代表測點估算樣帶平均土壤含水率均具有較高的精度,相比較而言,最小相對差分標準差平衡法精度更高。
[Abstract]:A typical alpine meadow ecosystem in Naqu region of northern Tibet Plateau was selected as the research object. Soil moisture content of 0 ~ 7.5 cm in the surface layer of 82 samples was measured by TDR 300, and the soil moisture content was measured 14 times in 2015 growing season. The temporal and spatial variability and time stability of soil moisture content were analyzed based on the measured data. The results showed that the average soil moisture content in the surface layer of the two zones was 26.0 in the growth season of 2015, showing weak variability in space, moderate variability in time, and high soil moisture content. The spatial model of soil moisture content in 82 sites was weak in July and early August, and the similarity was stronger in mid-August and early September, and the relative difference average value of soil moisture content was -11.5% or 8.5%. The average value of the relative difference standard deviation is 8.6. The relationship between the two shows the conic relation of opening up, which indicates that the measuring point with soil moisture content close to the average value of the sample land has higher time stability, while at the dry and wet measuring points, The time stability of soil moisture content is relatively weak, the time stability index, mean absolute deviation, root mean square error and minimum relative difference standard deviation balance method can accurately determine the best time stability of soil moisture content. The precision of estimating the average soil moisture content by using the best representative measuring point is higher than that of the minimum relative difference standard deviation equilibrium method.
【作者單位】： 中國科學院地理科學與資源研究所生態(tài)系統(tǒng)網(wǎng)絡(luò)觀測與模擬重點實驗室;中國科學院大學資源與環(huán)境學院;
【基金】：國家自然科學基金項目(41230746)
【分類號】：S152.7

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