甘肃联合大学学报：自然科学版
甘肅聯閤大學學報：自然科學版
감숙연합대학학보：자연과학판
Journal of Gansu Lianhe University :Natural Sciences
2012年
3期
63-68
,共6页
灌淤土%土壤养分%半变异函数%空间自相关性
灌淤土%土壤養分%半變異函數%空間自相關性
관어토%토양양분%반변이함수%공간자상관성
irrigation-silted soil%nutrients%spatial variability%geostatistics
采用规则网格取样、土壤养分状况系统研究法，应用一般统计学和地统计学理论研究宁夏灵武良繁场灌淤土耕层土壤有机质和速效Ca、Mg、K、P、S、NH4^＋-N含量空间变异性．结果表明，研究区土壤NH4^＋-N、速效K、P含量普遍较低，其低于临界值的比例分别为100％、61％和53％；速效P的变异系数最大，为66．6％，其它养分变异系数在19．1～34．8％之间．地统计学分析表明，NH4^＋-N和速效S在该采样尺度下不具备空间自相关性，而有机质、Ca、Mg、K、P具有较强的空间自相关性，块金效应在（0～20）％之间．在此基础上，利用普通克里格插值方法绘制了土壤速效Ca、Mg、K、P含量分布图．基于土壤养分状况和空间分布特征，目前仅需要考虑对该村土壤K，P进行分区管理．
採用規則網格取樣、土壤養分狀況繫統研究法，應用一般統計學和地統計學理論研究寧夏靈武良繁場灌淤土耕層土壤有機質和速效Ca、Mg、K、P、S、NH4^＋-N含量空間變異性．結果錶明，研究區土壤NH4^＋-N、速效K、P含量普遍較低，其低于臨界值的比例分彆為100％、61％和53％；速效P的變異繫數最大，為66．6％，其它養分變異繫數在19．1～34．8％之間．地統計學分析錶明，NH4^＋-N和速效S在該採樣呎度下不具備空間自相關性，而有機質、Ca、Mg、K、P具有較彊的空間自相關性，塊金效應在（0～20）％之間．在此基礎上，利用普通剋裏格插值方法繪製瞭土壤速效Ca、Mg、K、P含量分佈圖．基于土壤養分狀況和空間分佈特徵，目前僅需要攷慮對該村土壤K，P進行分區管理．
채용규칙망격취양、토양양분상황계통연구법，응용일반통계학화지통계학이론연구저하령무량번장관어토경층토양유궤질화속효Ca、Mg、K、P、S、NH4^＋-N함량공간변이성．결과표명，연구구토양NH4^＋-N、속효K、P함량보편교저，기저우림계치적비례분별위100％、61％화53％；속효P적변이계수최대，위66．6％，기타양분변이계수재19．1～34．8％지간．지통계학분석표명，NH4^＋-N화속효S재해채양척도하불구비공간자상관성，이유궤질、Ca、Mg、K、P구유교강적공간자상관성，괴금효응재（0～20）％지간．재차기출상，이용보통극리격삽치방법회제료토양속효Ca、Mg、K、P함량분포도．기우토양양분상황화공간분포특정，목전부수요고필대해촌토양K，P진행분구관리．
Spatial distribution and variability of organic matter.available Ca,Mg.K.P,S and ammonium N in irrigation-silted soil in Lingwu, Ningxia Hui Autonomous Region were characterized by classic statistics and geostatistics with grid sampling and systematic approach for soil nutrients status evaluation. The results showed that the content of the organic matter, N, K and P in topsoil were deficient and the percentage of soil available N,K,P below critical values were 100 %,61% and 53% respectively. The variation coefficients of available P was the highest（66.6%） and of the other available nutrient were between 19.1 and 34.8%. Geostatistical methods was used and found that spatial autocorrelation of organic matter Ca,Mg,K and P have stronger autocorrelation and the ratios of nugget to sill ＋nugget of them were between 0 and 20%. Whereas spatial autocorrelation of N and S showed effect of pure nugget. Ordinary kriging interpolation was used to map the available content of Ca,Mg,K,P. Based on the nutrients situation and spatial distribution characteristics ,the key nutrient in the management are K and P in the study village.
