黑龙江松嫩平原土壤有效态中微量元素的空间分布特征   总被引：1，自引：1，他引：0  

李志斌  陈佑启  姚艳敏  石淑芹 《干旱区资源与环境》2008,22(5):127-133

运用地统计学结合GIS技术研究了黑龙江松嫩平原农业区土壤中微量元素的空间分布特征,通过对数转化、域法处理和Box-Cox转化3种数据处理方法对土壤有效钙、有效镁、有效硼、有效铜和有效锌进行了正态分布性检验。结果表明,有效钙原始数据很好的服从正态分布,Box-Cox转化成功地使有效镁、有效硼、有效铜、有效锌含量数据更好的服从正态分布。应用地统计学分析方法进行了半方差函数的计算和最适合模型的拟合,得出各元素最好的理论模型,并绘制了各养分元素的空间分布图。半方差分析的结果显示,各元素具有中等空间相关性,并对造成现有空间分布特征的原因进行了分析。  相似文献   

云南曲靖烟区烤烟多酚与挥发碱含量的空间分布特征研究     

刘芳  张拯研  解燕  李祖红  李永忠  文国松 《云南农业大学学报(自然科学版)》2011,26(4):510-515

 为了解曲靖烟区烤烟中多酚与挥发碱含量的变化规律,采集了142个烤烟样品并利用地统计学与GIS技术结合的方法研究了中部叶（C3F）多酚和挥发碱总量的空间分布特征。结果表明：曲靖烟区烤烟多酚含量最大值为6.40%,最小值为3.34%,平均值为4.49%,富源最高,陆良最低;挥发碱含量最大值为0.34%,最小值为0.13%,平均值为0.22%,富源最低,陆良最高。曲靖烟区烤烟多酚含量表现出从东往西逐渐降低,随着海拔高度的增加而有明显的下降趋势。挥发碱含量则从东往西升高,与烤烟种植的海拔高度变化的关系不明显。  相似文献   

基于GIS和地统计学的干旱绿洲地区土壤水分时空变化     

刘强  杨东 《贵州农业科学》2017,45(5)

探明干旱绿洲地区土壤水分变化特征,为其生态保护和植被恢复提供参考,以甘肃省张掖市甘州区80个0~20cm土层土样为研究对象,利用GIS和地统计学相结合方法研究其土壤水分的时空变化特征。结果表明:9月在甘州地区0~20cm土层土壤的水分含量以10cm土层最高,为18.6%;20cm土层其次,为16.5%;表土层(0cm土层)最小,为11.7%;该月土壤的水分含量随土层深度增加呈先升高后降低趋势,且以10cm土层土壤的收墒蓄水作用较明显。4月以20cm土层土壤的水分含量最高,为16.74%;10cm土层其次,为13.44%;表土层最小,为12.26%;该月土壤水分含量随土层深度增加呈逐渐升高趋势。土层土壤水分含量的空间分布,在4月和9月均表现为由南向北、由东向西呈逐渐降低趋势。  相似文献   

Spatial variability of soil penetration resistance in an alluvial delta plain under different land uses in middle Black Sea Region of Turkey     

Mustafa Sağlam  Orhan Dengiz 《Archives of Agronomy and Soil Science》2017,63(1):60-73

The aim of this study was to analyse the soil compaction and its spatial variability on an alluvial plain in K?z?l?rmak River Delta in Turkey, which is an important agricultural area where vegetable, rice, cereals and other crops have been grown under conventional tillage and irrigation over a long period. Penetration resistance (PR) was measured at 5 cm depth intervals between 0 and 40 cm soil depth, and gravimetric water content (GWC), field capacity (FC) and texture were determined for 0–20 cm and 20–40 cm. Penetration resistance values in some parts of the area were higher than the critical value for root growth limitation, the mean PR values at all depths were considerably lower than the critical value despite a relative increase in PR with soil depth. The areas with values greater than 3.0 MPa, except for 0–5 cm, were generally located in the fields with high sand content, especially near the K?z?l?rmak River. In contrast, for 0–5 cm, the areas with PR greater than 3.0 MPa, which is the value accepted for root growth limitation, were usually located in the west and northwest of the study area and had a high clay content.  相似文献   

灌溉前后沙质裸地表层土壤蒸发量的时空变异性   总被引：1，自引：0，他引：1  

龙桃  熊黑钢  李宝富  张建兵  瓦哈甫·哈力克 《干旱地区农业研究》2010,28(4):1-6

利用野外实测数据建立的表层土壤日蒸发量和含水率间的函数关系,估算了灌溉前后3个时段的土壤日蒸发量,并以多种数学方法对其空间特征进行了探讨。结果表明:(1)灌溉后前期(1周)与后期(3周)的土壤蒸发量呈显著的负相关关系,其余各时段蒸发量的相关性不显著;(2)灌溉前土壤蒸发量的总体差异较大,空间关联性很弱,呈随机的斑块状分布,灌溉后总体差异明显减小,空间关联性增强,分布类型转为区域化分布;(3)由随机因素引起的空间异质性在灌溉后则更多地受空间自相关控制;(4)由于林带、芦苇丛和微地形的影响,灌后1周时采样区西边的土壤蒸发量大于东面,其余两个时段东西向无明显差异;灌溉前南部区域土壤蒸发量较北部区域大,灌后1周时该种情形被逆转,灌后3周时又转为向灌溉前回归。  相似文献   

Spatial heterogeneity of soil chemical properties between Haloxylon persicum and Haloxylon ammodendron populations   总被引：1，自引：0，他引：1  

CongJuan LI  Yan LI  Jian MA  LianLian FAN  QinXue WANG 《干旱区科学》2010,2(4):257-265

Spatial heterogeneity is a ubiquitous feature in natural ecosystems, especially in arid regions. Different species and their discontinuous distribution, accompanied by varied topographic characteristics, result in soil resources distributed differently in different locations, and present significant spatial heterogeneity in desert ecosystems. In this study, conventional and geostatistical methods were used to identify the heterogeneity of soil chemical properties in two desert populations, Haloxylon persicum Bunge ex Boss., which dominates on the slopes and tops of sand dunes and Haloxylon ammodendron (C. A. Mey.) Bunge, which inhabits interdunes in the Gurbantunggut Desert of Xinjiang, China. The results showed that soil pH, electrical conductivity (EC), soil organic carbon (SOC), available nitrogen (AN) and available phosphorus (AP) were significantly higher in H. ammodendron populations than that in H. persicum. The coefficient of variation (CV) indicated that (1) most parameters presented a moderate degree of variability (10% < CV < 100%) except pH in both plots, (2) the variability of soil pH, EC and AP in H. ammodendron populations was higher than that in H. persicum populations, and (3) SOC and AN in H. ammodendron populations were lower than that in H. persicum populations. Geostatistical analysis revealed a strong spatial dependence (C0/(C0+C) < 25%) within the distance of ranges for all tested parameters in both plots. The Kriging-interpolated figures showed that the soil spatial distribution was correlated with the vegetation distribution, individual size of plants, and the topographic features, especially with the plants nearest to sampling points and the topographic features. In each plot, soil EC, SOC, AN and AP presented similar distributions, and fertile islands and salt islands occurred in both plots but did not affect every individual plant, since the sampling distance was larger than the size of such fertile islands. The results of topographic effects on soil heterogeneity suggested s  相似文献   

土壤速效氮、磷、钾含量空间变异特征及其影响因子   总被引：17，自引：1，他引：16  

庞夙  李廷轩  王永东  余海英  吴德勇 《植物营养与肥料学报》2009,15(1):114-120

利用地统计学和GIS相结合的方法,探讨了双流县土壤速效氮、磷、钾含量空间变异特征及其影响因子。结果表明:1) 土壤速效氮和速效钾含量具有强烈的空间相关性,相关距离分别达38754 m和56187 m,结构性因子是影响其空间变异的主要因子;土壤速效磷含量具有中等空间相关性,相关距离为24210 m,其空间变异受结构性因子和随机性因子共同影响。2) 土壤速效氮含量主要由北向南逐渐降低;速效磷含量主要在东北向西南及东南向西北方向上逐渐降低,而速效钾含量主要由东南向西北逐渐降低。3) 土壤速效氮含量在不同土壤类型及地形地貌间呈极显著差异;土壤速效磷含量在不同成土母质及地形地貌间呈显著或极显著差异;土壤速效钾含量在不同成土母质间呈极显著差异。土壤速效氮、磷、钾含量高值区单位面积化肥施用量明显高于低值区。  相似文献   

沙棘柔性坝影响下砒砂岩沟道土壤水分空间变异分析   总被引：2，自引：0，他引：2  

杨方社  曹明明  李怀恩  杨联安  毕慈芬  乔旺林 《干旱区资源与环境》2013,(7):161-167

根据典型砒砂岩区内蒙古鄂尔多斯准格尔旗境内植有沙棘柔性坝的东一支沟道与无任何植物的对比沟道的表层(0-30cm)土壤含水量数据,运用地统计学方法分析与探讨了沙棘对砒砂岩区小流域沟道土壤水分小尺度空间变异的影响。结果表明:沙棘可明显提高砒砂岩区小流域沟道土壤含水量;沙棘柔性坝沟道与对比沟道土壤含水量具有明显的空间变异特征,沙棘柔性坝沟道土壤含水量在1-6m变程内具有中等程度的空间自相关性,对比沟土壤含水量在1-5m变程内具有较高的空间自相关性;土壤含水量分数维值表明,沙棘柔性坝沟道土壤含水量的空间依赖性比对比沟的要弱些;沙棘对小尺度土壤水分空间分布格局及其异质性有显著影响。应当指出的是,虽然降雨是土壤含水量空间自相关与分布格局影响的主要因素,但干旱条件也不容忽视,在长时间地表蒸发及植物蒸腾作用下,沟床表层土壤含水量空间变异性会进一步加强,且在一定程度上会影响沟床表层短根系及一年生草本植物的生长与分布。  相似文献   

植烟前后土壤有效锰含量的空间变异特征     

王雪婧  常栋  孔毅  刘国顺 《河南农业大学学报》2013,47(3)

采用地统计学和地理信息系统(GIS)相结合的方法,对植烟前后土壤有效锰含量的空间变异规律进行研究.结果表明,植烟后土壤有效锰平均含量比植烟前有所降低,从60.10 mg·kg-1下降至49.82 mg·kg-,差异达到了显著水平;植烟前后土壤有效锰含量的分维数分别为1.929和1.853,变程分别为42.3和89.1 m,最优模型分别是指数模型和球状模型,块金系数由6.13％增至41.20％;植烟前区域土壤有效锰含量在0°,45°,90°和135°方向表现为各向异性,烟草收获后在4个方向表现为各向同性;烟草种植后,土壤有效锰含量在低值和高值范围变化最为显著,低值(小于47.61 mg· kg-1)所占面积由8.7％增加到38.9％,高值(大于60.01mg·kg-)由45.8％降低为17.1％.  相似文献   

茶园主要天敌对4种害虫的空间跟随关系   总被引：2，自引：0，他引：2  

周夏芝  毕守东  黄勃  柯胜兵  邹运鼎  施晓丽  柯磊  杨林  郭骅  林源 《华南农业大学学报》2013,34(4):489-498

为了合理保护和利用天敌,开展了潜山县茶园假眼小绿叶蝉 Empoasca vitis、通草粉虱Dialeurodes citri、茶黄蓟马Scirtothrips dorsalis 和茶蚜Toxopetera aurantii 与其主要天敌之间空间关系的研究. 运用地学统计学方法分析天敌和害虫空间变程,应用灰色关联度分析方法分析害虫与天敌变程的关联度,得出以下结果：与假眼小绿叶蝉空间跟随关系密切的前2位天敌是八点球腹蛛Theridion octomaculatum和斑管巢蛛Clubiona reichlini;与通草粉虱空间跟随关系密切的前2位天敌是八点球腹蛛和草间小黑蛛Erigonidium graminicolum;与茶黄蓟马跟随关系密切的前2位天敌是草间小黑蛛和八点球腹蛛;与茶蚜跟随关系密切的前2位天敌是异色瓢虫Harmonia axyridis和草间小黑蛛.  相似文献