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1.
新疆民丰县农田土壤微量营养元素含量及分布   总被引:1,自引:0,他引:1  
基于新疆民丰县85组农田表层土壤样品中的6种微量营养元素(Fe、B、Mn、Cu、Zn、Mo)的实测含量,运用地统计学方法对研究区土壤中微量营养元素的含量及空间分布进行分析。结果表明:Cu、Fe、Mn元素的块金系数在25%~75%,为中等程度的空间自相关性,空间变异同时受到自然因素和人为因素的影响;土壤B、Zn、Mo元素的块金系数小于25%,具有强烈程度的空间自相关性,空间变异受到影响的因素主要有成土母质、气候等自然条件。Fe、B、Zn元素的平均含量处于较缺乏水平,Mn、Cu元素的平均含量处于中等水平,Mo元素的平均含量处于较丰富水平。研究区土壤中6种微量元素之间存在一定程度的相关性。土壤有机质和pH对土壤微量营养元素含量均有不同程度的影响。  相似文献   

2.
新疆民丰县农田土壤微量营养元素含量及分布   总被引:1,自引:0,他引:1  
基于新疆民丰县85组农田表层土壤样品中的6种微量营养元素(Fe、B、Mn、Cu、Zn、Mo)的实测含量,运用地统计学方法对研究区土壤中微量营养元素的含量及空间分布进行分析。结果表明:Cu、Fe、Mn元素的块金系数在25%~75%,为中等程度的空间自相关性,空间变异同时受到自然因素和人为因素的影响;土壤B、Zn、Mo元素的块金系数小于25%,具有强烈程度的空间自相关性,空间变异受到影响的因素主要有成土母质、气候等自然条件。Fe、B、Zn元素的平均含量处于较缺乏水平,Mn、Cu元素的平均含量处于中等水平,Mo元素的平均含量处于较丰富水平。研究区土壤中6种微量元素之间存在一定程度的相关性。土壤有机质和pH对土壤微量营养元素含量均有不同程度的影响。  相似文献   

3.
对长武县十里铺村长期定位试验旱地土壤,用重铬酸钾容量法对土壤有机质进行测定,用DTPA浸提-原子吸收法对有效态微量元素进行测定,研究不同轮作次序对土壤有机质和有效态微量元素分布的影响。结果表明,土壤有效态微量元素的分布除受微量元素总量的影响外,还与作物的轮作次序有关。不同轮作次序土壤有机质均呈现先减小后增大的趋势,有效铁由上到下持续增加,有效锰和有效锌呈现上高下低的趋势,有效铜的分布趋势是由上到下先增加后缓慢减少。粮草轮作体系80~100 cm土层有机质含量在11.08~11.89 g·kg~(-1)之间,粮豆轮作体系该土层含量为11.04~11.72 g·kg~(-1)之间。粮草轮作系统中3年小麦的土壤有效铁和有效锰含量较低,种植苜蓿和马铃薯可以提高土壤有效锰含量,连续种植小麦和连续种植苜蓿土壤有效锌和有效铜含量出现下降的趋势。粮豆轮作系统中小麦+糜子茬口土壤有效铁含量较高,小麦茬口的土壤有效锰含量最低,比小麦+糜子茬口和豌豆茬口的含量平均低7.73%~30.55%。粮草轮作系统中土壤有效态微量元素的含量高于粮豆轮作系统,在80 cm以上土层,两个轮作系统中土壤有效态微量元素的含量差异较大,在该土层以下,两个系统间的差异减小。  相似文献   

4.
喷施锌肥对小麦籽粒锌铁铜锰营养的影响   总被引:6,自引:0,他引:6  
喷施锌肥是提高中国北方潜在缺锌石灰性土壤上小麦籽粒锌含量及生物有效性的有效措施,但这种措施是否会显著影响其它微量元素的吸收和累积,从而影响微量元素的整体营养状况问题值得研究。为此,在陕西杨凌潜在缺锌土壤上进行了连续两季的小麦不同生育期田间喷锌试验。结果表明,喷施锌肥对小麦无显著增产作用;第一季(2007~2008)和第二季(2008~2009)中,与不喷锌比较,不同生育期喷锌后除了小麦籽粒的平均锌含量分别提高51.7%和73.5%外,其平均铁含量也提高了12.4%和12.9%;拔节期和扬花期喷锌对小麦籽粒铜含量无明显影响,但灌浆前期和灌浆后期喷锌会降低其铜含量;而籽粒锰含量对喷锌则无明显反应;喷锌后小麦籽粒平均植酸含量则分别降低了11.1%和16.9%。施用氮肥增加了籽粒锌铁铜锰的吸收总量;同时还降低了小麦籽粒植酸含量。总之,在供试土壤上,喷施锌肥可以有效地提高小麦籽粒锌铁含量,锌铁间存在着互助关系,同时喷锌也增加了其微量元素的吸收总量,降低了籽粒植酸含量,提高了小麦籽粒微量元素的生物有效性。  相似文献   

5.
基于若羌县2015年143组0~20 cm土层土壤6种微量营养元素(Fe、Mn、Zn、Cu、Mo和B)的实测含量,运用多元统计分析、地统计学和Arc GIS技术相结合的方法,对研究区土壤微量营养元素的含量和空间分布特征进行分析。结果表明:Fe、Mn、Zn、Cu、Mo和B变异系数介于18.2%~47.4%,均属于中等变异。Fe、Mn、Zn、Mo和B的块金效应均小于25%,空间相关性较强,空间变异主要受到土壤母质等结构性变异主导;Cu的块金效应介于25%~75%之间,属于中等空间相关,空间变异受到人为活动等随机因素和结构性因素的共同影响。Fe、Mn、Zn和Cu的空间分布格局相似,总体呈现出从研究区四周向中心含量逐渐增大的趋势;Mo和B的空间分布格局相似,总体呈现出从南向北含量逐渐增大的趋势。土壤有机质、pH值和不同的成土母质、土壤类型、土地利用类型对土壤微量营养元素均有不同程度的影响。  相似文献   

6.
以石泉县研究区678个表层(0-20cm)土壤样品微量营养元素(Fe2O3、Mn、Zn、Cu、Mo、B)的实测含量为对象,采用地统计学与GIS相结合的方法,对土壤微量营养元素的含量及空间分布特征进行分析.结果表明:研究区土壤微量营养元素含量的平均值均高于全国平均值,Mn平均值低于区域背景值,但相差不大.趋势效应参数分析...  相似文献   

7.
乌鲁木齐城市土壤性质及污染研究   总被引:11,自引:4,他引:7  
通过对乌鲁木齐城市土壤基本理化性质、营养盐特征、重金属污染的研究,结果表明:乌鲁木齐市城市土壤较自然土壤碱性更强、有机质丰富;氮素缺乏,磷有明显的累积特征;Cr,Cu,Pb,Zn含量很高,Mn,Fe含量不高;除Mn和Fe以外,其他重金属及有机质、总氮、总磷在不同功能区的空间分布差异都很大;重金属形态均以残渣态为主,但各重金属形态分布规律并不完全相同,Pb的活性最大,Fe的活性最小.  相似文献   

8.
Nutrient deficiency may be a reason for citrus decline in many countries. In the current investigation, soil and leaf samples of 63 Washington Navel orange orchards in arid lands of southern Iran (Darab region) were analyzed to study the nutritional status of orange orchards and to find relationships between soil properties and nutrients content of soils and orange leaves. The soils differed widely in clay content (3–37%), pH value (7.04–7.95), calcium carbonate equivalent (18–86%), and organic matter content (0.3–12%). These soils represented a wide range of plant nutrients concentration. Majority of the studied soils had sufficient concentrations of all nutrients (except Fe). Results indicated that pH, organic matter, clay, and calcium carbonate contents are the most important characteristics that control the soil nutrients availability. The mean contents of N, K, P, Fe, Mn, Zn, and Cu in leaves were 2.59, 0.84, and 0.14% and 66, 44, 17, and 12?mg?kg?1, respectively. Most orchards showed K, Fe, and Zn deficiencies. We found no relationships between nutrients content in leaf and soil (except for K, Mn, and Zn); and this indicated that soil analysis may not be a reliable method for most nutrient deficiency diagnosis.  相似文献   

9.
基于G IS技术,通过地统计学方法对张掖临泽、山丹、民乐县和甘州区农田表层土壤有效Fe、Cu、Zn、Mn、N i和Co含量的空间变异、丰缺状况及影响因素进行了研究。结果表明:有效Fe含量的最适模型为球状模型,Cu、Zn和N i为指数模型,Mn和Co为高斯模型;有效N i和Mn具有强烈空间相关性,有效Fe、Cu、Zn和Co具有中等空间相关性;各微量元素有效态含量均具有各向异性。研究区域有效Fe、Cu、Zn和N i含量在甘州区最高,有效Mn和Co含量由东南到西北逐渐减小;有效Cu和N i含量大部分面积处于中等及丰富水平,而有效Fe、Zn和Mn含量为中等及偏低水平。土壤有机质与六种微量元素有效态含量均呈显著或极显著正相关;pH与有效Fe、Cu、Zn和N i含量呈显著或极显著负相关。  相似文献   

10.
Effects of sludge utilization on the mobility and phytoavailability of heavy metals in soil-plant systems have attracted broad attention in recent years. In this study, we analyzed the effects of municipal sludge compost(MSC) on the solubility and plant uptake of Cd, Ni, Cu, Zn and Pb in a soil-potato system to explore the mobility, potato plant uptake and enrichment of these five heavy metals in sierozem soils amended with MSC through a potato cultivation trial in Lanzhou University of China in 2014. Ridge regression analysis was conducted to investigate the phytoavailability of heavy metals in amended soils. Furthermore, CaCl_2, CH_3 COONH_4, CH_3COOH, diethylene triamine pentacetic acid(DTPA) and ethylene diamine tetraacetic acid(EDTA) were used to extract the labile fraction of heavy metals from the amended soils. The results show that the MSC could not only improve the fertility but also increase the dissolved organic carbon(DOC) content of sierozem soils. The total concentrations and labile fraction proportions of heavy metals increase with increasing MSC percentage in sierozem soils. In amended soils, Cd has the highest solubility and mobility while Ni has the lowest solubility and mobility among the five heavy metals. The MSC increases the concentrations of heavy metals in the root, stem, peel and tuber of the potato plant, with the concentrations being much higher in the stem and root than in the peel and tuber. Among the five heavy metals, the bioconcentration factor value of Cd is the highest, while that of Ni is the lowest. The complexing agent(DTPA and EDTA) extractable fractions of heavy metals are the highest in terms of phytoavailability. Soil properties(including organic matter, p H and DOC) have important impacts on the phytoavailability of heavy metals. Our results suggest that in soil-potato systems, although the MSC may improve soil fertility, it can also increase the risk of soils exposed to heavy metals.  相似文献   

11.
不同草地类型土壤有效态微量元素含量特征   总被引:11,自引:1,他引:10  
以贺兰山西坡不同草地类型土壤为对象,研究了土壤中微量元素Fe,Mn,Zn,Cu有效态含量特征及土壤有机碳、pH值、黏粉粒含量与气候因素之间的相互关系。结果表明:土壤有效态Fe,Mn,Zn的含量随着海拔的降低而逐渐降低,有效态Cu含量的积累顺序为:山地草原>荒漠化草原>高山草甸>草原化荒漠。4种元素在各种草地类型的积累量变化为:高山草甸Fe>Mn>Zn和Cu;山地草原和荒漠化草原Fe>Mn>Cu>Zn,草原化荒漠土壤中Fe和Mn含量差异不大,并大于Zn和Cu。土壤有效态Fe,Mn,Zn的含量与年均降水量、土壤有机碳、<0.05 mm黏粉粒含量都呈显著正相关,而与年均温度和土壤pH值呈显著负相关。土壤有效态Cu含量与年降水量、年均温度、土壤有机碳含量和<0.05 mm黏粉粒含量基本呈二次多项式,而与土壤pH相关性不显著。影响土壤有效态Fe和Mn含量的关键因素,0~20 cm土层为有机碳、年降水量和年均温,而20~40 cm土层土壤有机碳是其最重要的影响因素。0~20 cm土层土壤有效态Zn主要受土壤pH、黏粉粒含量和年降水量的影响。  相似文献   

12.
洛川苹果园土壤养分等级及与有机质的关系   总被引:1,自引:0,他引:1  
在苹果优生区洛川县域范围内,选取管理措施不同的果园采集土壤样品,对其土壤有机质、全量N、P、K及速效养分和微量元素进行了等级分布研究。分析结果表明,洛川果园土壤有机质、全氮、碱解氮属于偏低水平;土壤有效磷变异大,部分果园有累积现象,土壤速效钾含量丰富。微量元素铁、锰、铜、锌较缺乏,相对而言,缺锌程度最大;土壤有效铜变异较大。土壤有机质与全氮、碱解氮和有效磷呈极显著正相关,与有效铁、有效锌呈显著正相关,与有效铜、有效锰的相关性较低;苹果园产量随着土壤有机质含量的增加而增多。  相似文献   

13.
甘肃省河西地区灌漠土养分限制因子研究   总被引:4,自引:0,他引:4  
通过实验室分析及温室盆栽,研究了甘肃省河西地区张掖、武威、金昌及民勤等四地灌漠土的土壤养分状况。结果表明:张掖九公里土壤主要缺N,其次缺Cu,从最佳处理(OPT)中减N、Cu处理,盆栽试验植株干物重分别下降了45.81%、17.44%;武威五爱村土壤养分限制因子为N、P、S、Cu,减N、P、S、Cu处理与最佳处理相比相对产量分别下降31.13%、28.87%、20.82%、16.69%;民勤羊路灌漠土缺N、P、Cu、Fe、Zn,不施N、P、Cu、Fe、Zn的相对产量分别为47.38%、68.77%、70.91%、78.40%和80.21%;金昌小井子农场土壤主要缺P、N、Mn、Zn,从最佳处理中减P、N、Mn、Zn处理,植株干物重分别下降了31.79%、14.53%、22.31%、21.77%。可见河西地区灌漠土氮、磷普遍缺乏;张掖和武威等地的微量元素铜,金昌和民勤等地的微量元素锌分别表现缺乏,铁、锰、硫个别表现不足。通过实验室测定结果与盆栽试验植株干物重关系的对照分析,发现实验室测定结果与盆栽试验结果有较好的一致性,尤其在土壤养分含量低于对应的养分亏缺临界值的元素上,表现出很好的对应关系,即测得土壤养分缺乏时,盆栽试验中不施该元素的植株干物重均显著低于最佳处理。  相似文献   

14.
黄土丘陵沟壑区土壤微量元素空间变异特征及其影响因素   总被引:4,自引:0,他引:4  
以安塞县为研究区,运用地统计学和GIS技术相结合的方法研究了黄土丘陵沟壑区土壤中有效态Fe、Mn、Cu和Zn的空间变异特征及其影响因素。结果表明:四种微量元素的变异系数在14.81%~22.49%之间,都属于中等变异性;块金效应值在11.76%~46.94%之间,Zn的空间相关性较强,Fe、Mn和Cu的空间相关性中等;各微量元素含量在空间分布上呈现出由北部和南部向中部递减的趋势。土壤类型对Mn和Cu的含量有显著影响,灰褐土中Mn和Cu的含量高于黄绵土。相对高程与Fe、Mn和Zn呈极显著负相关;坡度与Mn和Cu呈显著或极显著负相关;地形起伏度与Fe和Cu呈显著或极显著负相关。有机质、碱解氮、有效磷和速效钾与Cu呈显著或极显著负相关,与Zn呈极显著正相关;速效钾与Fe和Mn呈极显著正相关;pH值与各微量元素均呈显著或极显著负相关。  相似文献   

15.
Understanding the status and distribution of the micronutrient Zn in soils is important for managing plant growth and preventing soil pollution for agricultural irrigation systems in arid and semi-arid regions.In this study,a total of 195 soil samples from five soil layers(0–20,20–40,40–60,60–80 and 80–100 cm) in the three land-use types(wasteland,forestland and cropland) after long-term agricultural fertilization and irrigation with Yellow River water were collected in the middle of the Hetao oasis,i.e.the Yongji irrigation sub-oasis.We analyzed the vertical and spatial distributions of Zn content and its relationship with soil properties to determine whether differences of Zn content existed in the soil profiles.The results revealed that the mean content of Zn was 107 mg/kg,1.9 times higher than the background value(55.7 mg/kg) of the Hetao oasis and much lower than the secondary standard value(300 mg/kg) of the Chinese Environmental Quality Standard for Soils when p H7.5.Soil Zn contents were not significantly different and the coefficients of variation of Zn contents were less than 50% in the five soil layers.Soil Zn content was similar from southern to northern parts but increased from western to eastern parts in the sub-oasis.Soil Zn contents did not differ significantly among the three land-use types,but soil total nitrogen(TN) contents were significantly higher in the agriculturally managed forestland and cropland than in the wasteland(P0.05).Zn was significantly and positively correlated with TN(F=36.6,P0.001).The use of fertilizers may increase the content of Zn in soils,but flooding irrigation may minimize the differences in the spatial distribution of soil Zn content in the whole sub-oasis.This research is of important value for soil pollution control and sustainable land use management in arid and semi-arid regions.  相似文献   

16.
黄土区旱地长期施用微肥对冬小麦农艺性状及产量的影响   总被引:4,自引:0,他引:4  
以长达20年的微量元素肥料定位实验数据为基础,分析长期施用微肥对冬小麦农艺性状及产量的影响。结果表明:长期施用微肥对冬小麦有明显的增产效果,小麦施B增产481.8 kg/hm2,增产率30.3%;施Zn增产610.8 kg/hm2,增产率38.4%;施Mn肥籽粒增产368 kg/hm2,增产率23.1%;施Cu籽粒产量无明显变化。施用微肥小麦,籽粒、秸秆中微量元素含量增加,籽粒中含锌量增加10.47 mg/kg,增加率为49.79%;秸秆中含锌量增加3.84 mg/kg,增加率为47.5%;与施KH2PO4肥相比,籽粒中含锌量增加8.03 mg/kg,增加率为33.0%;秸秆中含锌量增加4.78 mg/kg,增加率为66.8%。  相似文献   

17.
对我国北方干旱草原牛心朴子(Cynanchum komarovii)全花的蛋白质、粗脂肪、总糖及钾、钙、镁、磷等9种微量元素进行了测定,并对不同花期微量元素及蛋白质的含量进行了比较研究。实验结果:牛心朴子花含有多种微量元素,并具有高蛋白、低脂肪、低糖的特点。其中,钾、钙、镁、磷元素的含量平均值2 000~10 850 mg/kg,钠、铜、锌、铁和锰元素的含量平均在14~450 mg/kg;初花期的蛋白质含量明显高于其盛花期和末花期。牛心朴子全花营养成分含量丰富,具有一定的开发利用价值。  相似文献   

18.
黑河中游绿洲农田土壤微量元素含量的空间分布特征   总被引:4,自引:0,他引:4  
采用地统计学与GIS相结合的方法,对黑河中游绿洲农田土壤中Cu、Zn、Ni、Fe、Mn和Co含量的空间变异特征、分布规律进行了研究。结果表明:研究区土壤Zn、Fe、Mn的含量平均值低于全国平均值,而Cu、Ni、Co的平均值高于全国平均值,6种微量元素均具有中等程度变异,且各微量元素样本均符合正态分布;土壤Cu、Ni含量的最佳半方差拟合模型为高斯模型,Zn、Fe和Mn为球状模型,Co为指数模型;土壤Cu、Zn、Ni、Fe、Co具有中等程度的空间相关性,土壤Mn具有强烈的空间相关性;6种微量元素含量的变程大小顺序为Cu、Zn、Mn>Fe>Co>Ni;土壤Cu、Zn、Fe、Mn含量的空间分布特征相似,即总体上为由东南向西北降低,Ni、Co含量呈现斑块状分布。研究区土壤中微量元素含量除Mn主要受自然因素影响外,其它各微量元素均受到自然因素和人为因素的双重影响。  相似文献   

19.

Sorption of added zinc to irrigated soils in arid regions is an important process that may control the availability of zinc to growing plants . Two soil surface samples varying in clay , organic matter , and calcium carbonate content were selected from central and southwestern regions of Saudi Arabia and prepared in order to give different initial moisture contents ranging from air dried to 100 % of field capacity . The sorption experiment was conducted using Zn concentrations ranging from 5 to 25 mg L 1, prepared from ZnSO4 either in distilled water or in solutions containing 75 mg L 1 dissolved organic carbon (DOC). Results indicate that the amount of Zn sorbed in the presence of DOC was relatively high compared with the absence of DOC and Zn retention was strongly affected by the initial soil moisture content . Also , equilibrium Zn concentrations were quite low , while Zn retentions were high in all treatments . Data of Zn sorption were described by the Freundlich isotherm , and two linear portions were found in most cases . In the absence of DOC , retentions of added Zn were controlled by the available exchange sites and / or the precipitation of Zn as sparingly soluble forms. Zn ions in the presence of DOC were able to form soluble - Zn organic complexes that adsorb on the soil surfaces . The extent of such behavior was related to the variations in clay , organic matter , and calcium carbonate contents as well as the initial moisture of the soil . Results indicate that addition of DOC reduces the amount of extractable Zn from either soil Zn or the sorbed Zn by ammonium bicarbonate diethylenetriamine pentaacetic acid ( AB DTPA ). More than 80 % of the sorbed Zn was extracted by AB-DTPA , and the percentage of extracted / sorbed Zn decreased with the increase in sorbed Zn . The obtained results give evidence that initial moisture content and addition of DOC reduce the extractability of applied inorganic Zn by AB-DTPA extract in arid soils.  相似文献   

20.
采用土壤养分状况系统研究法(ASI法),分析土壤养分状况及各养分对籽瓜与瓜籽的经济性状、瓜籽产量及收益的影响,确定各养分对籽瓜产量与效益的贡献率.结果表明,各养分对瓜籽的纵、横径无影响,N、P、K、Fe可明显提高单瓜鲜重、单瓜籽重、产籽率、瓜籽百粒重和出仁率,Cu、Mn、Zn则降低了单瓜籽重、产籽率和出仁率;各养分显著地提高了瓜籽的产量与经济效益,N仍是制约籽瓜产量的关键因素,其次为Zn、P,养分限制顺序为N>Zn>P>Fe>Mn>Cu>K;各养分对籽瓜产量与效益的贡献率大小有差异,氮素仍是增产、增收的主要限制因素,微量元素与钾素逐渐成为瓜籽产量与收益的限制因素.  相似文献   

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