本文關(guān)鍵詞：青藏高原高寒荒漠區(qū)土壤濕度監(jiān)測(cè)儀器的校正方法探討　出處：《地理研究》2017年11期 　論文類型：期刊論文

  更多相關(guān)文章： 土壤體積含水量 校正 介電常數(shù) 容重 溫度 青藏高原

【摘要】：ECH_2O EC-5土壤水分傳感器能有效地監(jiān)測(cè)土壤含水量,并且能揭示不同降水事件下的土壤水分動(dòng)態(tài)變化狀況。然而青藏高原主要土壤類型礫石含量高、晝夜溫差大、秋季和春季凍融現(xiàn)象顯著,導(dǎo)致監(jiān)測(cè)數(shù)據(jù)出現(xiàn)偏差�；趯�(duì)羌塘高原日土、改則地區(qū)布設(shè)的野外觀測(cè)站點(diǎn)采集的土壤樣品,對(duì)其進(jìn)行土壤含水量測(cè)定的室內(nèi)標(biāo)定試驗(yàn)。結(jié)果表明:(1)各個(gè)樣點(diǎn)均獲得了較好的擬合效果,基于擬合系數(shù)校正后的測(cè)量值可以有效地反映實(shí)際的土壤含水量情況;(2)不同土層深度及不同樣點(diǎn)的綜合校準(zhǔn)曲線精度明顯低于單點(diǎn)的校準(zhǔn)結(jié)果,主要受土壤容重和有機(jī)碳含量的影響,為獲取更精準(zhǔn)的校正數(shù)據(jù),分層的校準(zhǔn)是很有必要的;(3)基于已有校準(zhǔn)模型校正后的值可以反映含水量變化的整體態(tài)勢(shì),但會(huì)產(chǎn)生高估或低估于真實(shí)值的偏離。
[Abstract]:ECH_2O EC-5 soil moisture sensor can effectively monitor soil moisture content. But the main soil types of Qinghai-Xizang Plateau have high gravel content, large diurnal temperature difference, and significant freezing and thawing phenomena in autumn and spring. Based on the soil samples collected from the field observation stations in the Qiangtang Plateau, the soil samples were collected from the field observation stations in the Qiangtang Plateau. The results of indoor calibration test of soil moisture content showed that all the samples obtained good fitting results. The measured values based on the fitting coefficient can effectively reflect the actual soil moisture content. (2) the accuracy of comprehensive calibration curve of different soil depth and different points is obviously lower than that of single point calibration, which is mainly affected by soil bulk density and organic carbon content, in order to obtain more accurate correction data. Hierarchical calibration is necessary; 3) the corrected values based on the existing calibration models can reflect the overall situation of water content change, but they may cause overstatement or underestimation of the deviation from the real values.
【作者單位】： 中國科學(xué)院地理科學(xué)與資源研究所陸地表層格局與模擬重點(diǎn)實(shí)驗(yàn)室;西南大學(xué)資源環(huán)境學(xué)院;中國科學(xué)院大學(xué);中國科學(xué)院青藏高原地球科學(xué)卓越創(chuàng)新中心;
【基金】：國家科技基礎(chǔ)性工作專項(xiàng)重點(diǎn)項(xiàng)目(2012FY111400) 中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項(xiàng)(XDB03030501) 國家自然科學(xué)基金項(xiàng)目(41671104)
【分類號(hào)】：S152.7;TP216
【正文快照】： 1引言土壤水分是土壤的重要組成部分之一,在土壤的形成過程中發(fā)揮著極為重要的作用[1],深刻地影響著土壤有機(jī)質(zhì)的礦化、生物固氮、植物根系對(duì)養(yǎng)分和水分的吸收等化學(xué)或生物過程[2]。作為水資源不可或缺的一部分,土壤水是聯(lián)系地表水與地下水的樞紐,尤其是土壤表層的含水量在陸，

本文編號(hào)：1403564