DZN1型土壤水分自動(dòng)觀測數(shù)據(jù)的訂正

摘要：應(yīng)用2011年2-7月32次土壤水分自動(dòng)觀測數(shù)據(jù)與同時(shí)期用烘干稱重法人工測得的土壤水分?jǐn)?shù)據(jù)進(jìn)行對(duì)比分析，以人工測定數(shù)據(jù)為準(zhǔn)確值，先用前期2-5月20次對(duì)比觀測數(shù)據(jù)進(jìn)行逐步回歸分析，得到器測值的訂正方程；再用6-7月12次對(duì)比觀測數(shù)據(jù)對(duì)訂正方程進(jìn)行試用驗(yàn)證。結(jié)果表明，DZN1型土壤水分自動(dòng)觀測儀的部分土層未經(jīng)訂正即達(dá)標(biāo)，其他層訂正后可達(dá)標(biāo)，訂正效果明顯。此項(xiàng)工作可為該型儀器的廠家訂正及日常業(yè)務(wù)訂正提供參考。

關(guān)鍵詞：DZN1型；土壤水分；自動(dòng)觀測數(shù)據(jù)；訂正

中圖分類號(hào)：S152.7 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：0439-8114（2013）12-2920-03

Correction of DZN1 Soil Moisture Automatic Observation Data

CHEN Li-chun1，WU Ai-xia1，GUO Lei1，F(xiàn)AN Qing-dong1，WANG Shao-yu2，LIU Jian-zhong2

（1.Laiyang Meteorological Bureau of Shandong Province， Laiyang 265200， Shandong， China；

2. Meteorological Bureau of Fushan Region in Yantai City， Yantai 264002， Shandong， China）

Abstract： The 32 soil moisture data from Feb. to Jul. of 2011 collected by automatic soil moisture observation and artificial drying and weighting method was comparatively analyzed. Taking the artificial data as accurate value， the first 20 comparative observation data in Feb. to May was applied for stepwise regression analysis to obtain correction equation of measured value. Then the 12 comparative observational data in June and July was applied to verify the correction equation. The results showed that the data of some soil layer observed by DZN1 soil moisture automatic observation instrument was standard without correction， while of other layers could achieve the standard by correction； the correction effect was obvious. This work could provide reference for equipment manufacturers and daily business to revise this type of instrument.

Key words： type DZN1； soil moisture； automatic observation data； correction

土壤水分自動(dòng)觀測儀正逐步應(yīng)用到土壤濕度日常監(jiān)測業(yè)務(wù)，為獲得滿意的探測數(shù)據(jù)，近年來人們對(duì)土壤水分自動(dòng)觀測方法和儀器進(jìn)行了深入研究，比如張力計(jì)、射線法、電阻法、熱擴(kuò)散法、探針式電容測量法、時(shí)域反射法及此次對(duì)比觀測使用的頻域反射技術(shù)[1]，這些方法各具優(yōu)缺點(diǎn)，就目前情況看各型自動(dòng)儀都存在一定誤差[2-4]。山東省萊陽市氣象局安裝的DZN1型土壤水分自動(dòng)觀測儀是一種性能優(yōu)良的觀測儀器，該儀器安裝后經(jīng)過2011年上半年的自動(dòng)與人工對(duì)比觀測可以看出：自動(dòng)觀測數(shù)據(jù)一直較大，在土壤含水量明顯下降時(shí)，自動(dòng)觀測數(shù)據(jù)下降的幅度也很小；在土壤含水量較大時(shí)，人工測值與器測值接近。在土壤水分觀測中，干旱的監(jiān)測對(duì)于農(nóng)業(yè)生產(chǎn)意義重大，不進(jìn)行器測值的訂正達(dá)不到監(jiān)測干旱的目的，因此，訂正是非常必要的。……