| By the large number of long-term application of fertilizer and acid rain and other factors, soilacidification in China has become one of the major types of cultivated land quality degradation, and in thesouthern area is more serious. Based on the distribution in Fujian province in different geographical locationsin county and southern subtropical Tongan area as the study area, using two County in1982Second SoilCensus and2008land of formula fertilization by soil testing samples related analysis data, by using the GISand the mathematical model of integrated technology, for26years in different climatic zones of regionalcultivated land temporal and spatial variation of soil pH value to carry out research, analysis revealeddifferent climate area farmland soil acidification trend, degree, difference and its causes, and puts forward thecontrol measures of soil acidification in science. The results show that:1,1982and2008farmland soil pH values of Pucheng county were changed in2.89-7.19and4.48-5.31,the county average were5.66±0.18and4.92±0.11. In1982the farmland soil pH value spatial variation islarge. The coefficient of variation is3.15%.The pH maximum and minimum values are located in Liantangand Zhongxin Town,respectively in1982the county farmland soil pH mean of127.03%and84.98%;2008pH valuespatial variability is relatively small,.The coefficient of variation was2.24%, and the pH maximumand minimum value distribution in Yu Yongxing and Shipo Town,2008respectively of entire county farmlandsoil pH mean of107.93%and91.06%. Visible, thefarmland soil pH value of Pucheng county is roughlycentral high surrounded by low spatial variation rule.1982and2008farmland soil of Tongan District changes in4.95-7.71and4.75-8.27pH respectively,farmland soil pH value of the county average values were6.20±0.42and6.16±0.70. In1982the farmlandsoil pH value spatial distribution is relatively small, the coefficient of variation was6.77%, pH maximum andminimum values are located at Dadeng town and Lianhua town, the pH values were7.71and4.95,respectively, for the whole1982area farmland soil pH mean of124.35%and79.84%.2008farmland soil pHvalue spatial differentiation of relatively large, the coefficient of variation was11.36%, pH maximum andminimum values were distributed in the town of Xindian and the town of Lianhua, the pH values were8.27 and4.75, for the whole2008area farmland soil pH mean of134.25%and77.11%. Visible, the farmland soilpH value of Tongan district shows high in southeast, and low in northewest which reflect the spatial variationrule.2,26years of Pucheng County Cultivated Land Soil pH value decreased, dropped by an average of0.74units, amounting to13.07%, which decreased the amplitude of maximum and minimum are Shipo andYongxing Town, pH drop respectively16.14%and10.78%. The pH value decreased most soil types, soilgeneus, subclasses and soil groups, tillage are sand clay, sand soil tillage,percogenic paddy soil and red soil,the pH value decreased by1.13,1.13,0.79and0.76units; the smallest decline in soil types, soil geneus,subclasses and soil groups are paddy field, purple paddy soil, grey fluvo-aquic soil and fluvo-aquic soil, pHamplitude is respectively12.07%,11.57%,12.72%and12.66%. PH decreased the maximal and minimal use oftypes are irrigated paddy field and dry land, drop respectively13.11%and10.40%.The farmland soil pH value of Tongan Ditrict drop in overall0.03units in the past26years, down by0.48%. From different villages and towns arable soil pH change, in addition to Xindian town,the farm ofBaisha and the farm of Zhuba in pH value rises respectively0.52,0.17and0.09units, the other towns haavedeclined, falling to maximum and minimum township are Tingxi town and Xike town, drop respectively7.07%and0.13%. Tongan District, with the exception of a few soil types other than the rest of the soil typeshave decreased, the biggest drop in soil types, soil geneus, subclasses and soil groups are Sand dam soil, sanddam soil, coastal saline soil and coastal saline soil, decrease of pH value is0.76; the smallest drop soil types,soil geneus, subclasses and soil groups are red sand, red sand (yellow paddy soil, cold and muddy field),lateritic red soil and paddy soil, decrease respectively0.32%,0.33%,0.48%and0.48%; pH rise in Tong'anDistrict soil types are mainlydam field, ash dam field,red sands,green mud field and yellow paddy soil, pHappreciation respectively0.21,0.05,0.11,0.51and0.10; sand dam Tian pH values remain unchanged. PHdecline of minimum and maximum utilization types are Wang Tiantian and irrigation of paddy fields, pHdecreased by0.49and0.07units.3,Different from the subtropical regions of the Pucheng county and Tongan District, pH of the twoarea has declined in the past26years, located in the subtropical Pucheng county than in South Asia tropicalTongan District decreased the amplitude of much lower. In the common soil types, gray red dirt in the twoareas drops larger than other soil types, Pucheng county down0.79units, Tongan Ditrict0.47units down;The green mud field and yellow paddy soil's pH in Tongan District rise respectively0.51and0.09units, whilein the Pucheng county the two soil types are decreased by0.74units; in the common soil genus type, red clay and sandy cropland two soil in Pucheng and Tongan area two drops are larger, Pucheng county red clay andsandy cropland drop0.76units; Tongan District red clay and sandy cropland drop respectively0.47and0.19units; The green mud field and the wave soil's pH of Tongan District respectively up to0.51units, in Puchengcounty the two soil were decreased by0.74and0.73units; in common subclasses, in the two areas red dropsare droped larger, drop respectively0.76and0.46units; Tongan District submergic paddy soil increased by0.08units, while the subclass of Pucheng county drops0.79units; from the common the soil type, two reddrops are larger, decrease of pH values were0.76and0.46; county paddy soil0.76units down, Tongan areadecreased only0.04units; from the common land use types, both Wang Tiantian pH Value decrease, droprespectively0.73and0.49units, the soil pH value of Pucheng county than the Tongan area decreased theamplitude of a much larger.4,26years of strong, moderate,weak, in the Pucheng county of acidification of farmland areapercentage were62.05%,36.75%and1.15%, the strength of acidification of farmland are mainly distributed infrom the south to the north and west sides of the middle part, more moderate acidification of farmland.Tongan District soil26years the extent of acidification both enhancement was also weakened, the strong,moderate,weak, in the acidification of farmland area percentage were4.59%,29.16%and27.54%, thestrength of acidification of farmland basically distributings in Northwest and North Central, to moderate andweak acidification land; in addition, the region has partial farmland is neutral and weak alkali, neutralfarmland occupies whole area of cultivated land total area15.01%, weak base of the farmland occupies the4.35%of the total area of cultivated land. |
