土壤普查

与第二次土壤普查相比较，部分土壤的pH有所下降；碱解氮、有效磷和速效钾的含量均上升，其中有效磷提高得最快，碱解氮升高得较慢。

Compared with the second soil survey , the decreased trend of soil pH was observed , the soil available nitrogen , available phosphorus and available potassium increased , while the increment of the available phosphorus was greatest , that of the available nitrogen was less . 2 .

全国土壤普查科研项目成果简介

Brief introduction on achievements in national soil survey project since

根据中国第一次土壤普查得到的土壤各类型分布面积、采样数据、土壤有机质含量，运用GIS技术，来估算土壤碳库。

This paper adopted the soil distribution area , sampling data and soil organic content from the first soil general survey and applied the technique of GIS to estimate soil carbon reservior in China .

但第二次土壤普查至今已有20年，缺少完整的最近的土壤资料。而最近的有机碳资料一般通过全国化肥监测网的长期监测和GIS数据获得。

Studies on the SOC dynamics of China cultivated soils in the last 20 years have been conducted using SOC data normally obtained through monitoring of the long-term chemical fertilizer trials and GIS data in whole nation .

基于GIS技术平台，利用土壤普查数据，构建了全国表层土壤氮磷含量数据库，完成了2000年全国境内水土流失影响下吸附态氮磷的流失量估算。

Applying GIS and soil data of the second soil survey in China , the loss loads of absorbed nitrogen and phosphorus were simulated and estimated for the year of 2000 . There were three significant results .

在地理信息系统（GIS）支持下，利用农业统计资料和土壤普查数据，将农田基础数据与空间数据有机地结合进来，建立了江津市土壤养分数据库系统。

Supported by GIS ( geographic information system ) and using the local agricultural statistics and data in surveys , a soil nutrient database system of Jiangjin County was established , which intimately combines the farmland capital data with the spatial data .

以广东省第二次土壤普查成果资料为主要数据源，选取贝叶斯决策、BP神经网络、概率神经网络、聚类等分类方法分别对数据源进行分类；

In this paper , the Byes method , Backpropagation Neural Network ( BP ), Probabilistic Neural Network ( PNN ) method and Clustering method are used to classify the data rooted from the data of the second earth investigation result in Guangdong province .

该文以山东禹城20世纪80年代第二次土壤普查资料为基础，在GIS和Dempster-Shafer证据理论的支持下，旨在探讨影响土壤盐渍化的因子作用下引发的土壤潜在盐渍化的概率分布状况。

Based on soil investigation data from Yucheng City in Shandong Province in 1980 , using GIS ( Geographic Information System ) and Dempster-Shafer evidence theory , the probability of potential soil salinization affected by many factors was explored .

全国第二次土壤普查与土壤肥料科学的发展

The second nationwide general soil survey and the developments in soil and Fertilizer Sciences

与1980年海淀区全国第2次土壤普查结果相比，土壤养分普遍提高。

Compared to the results at 1980 , the nutrients content in arable soil increased in general .

尤其是第二次土壤普查的成果数据仍然以纸质图件、文字报告等形式进行保存。

These outcome data are generally the form of paper maps , and text reports to be saved .

据全国土壤普查资料估计，我国有1/3-1/2的土壤缺磷。

According to estimates of soil survey data , 1 / 3-1 / 2 of soil in China faces phosphorus deficiency .

与新疆土壤普查资料对比，污灌后，土壤的C/N比差异不大9.86&13.85；

Comparing with the second Chinese Soil General Survey , after sewage irrigated , C / N was 9.86 ~ 13.85 ;

自从20世纪80年代第二次土壤普查后，黄岩区的耕地资源发生了一系列的变化。

After the Second National Soil Survey in 1980s , arable land resources in Huangyuan have had a series of changes .

全国第二次土壤普查后以及全面开展耕地地力评价工作，相关成果数据种类繁多。

After the second national soil survey and carry out a comprehensive Evaluation of Farmland , the related achievement data type is many .

本文对桃山林区土壤普查进行分析，土壤类型与自然条件密切相关，而且随着外界条件变化而逐渐变化。

Having analysed the data of soil survey , the soil types have close relation to natural conditions and change with the external conditions .

在缺乏长期实测资料情况下，国内外多以模型、第二次土壤普查资料或较稀的实测数据进行研究。

The domestic and foreign scientists do the research by using models and the second soil survey data for lack of long-term actual material .

以实地调查和用土壤普查结果进行验证，此次自动分类的精度分别为92.60%和93.84%。

Compared with the results of example survey and the data of soil survey , the automatical classification accuracy was 92.60 % and 93.84 % , respectively .

但指导当地施肥的参数是二次土壤普查时建立的，原有的施肥指标已不能指导当前的农业生产。

However , the parameters guiding the local fertilizer was created during the second soil survey , and the original fertilization index can not guide the current agricultural production .

第二次全国土壤普查，本县土壤肥料主要存在问题：1.有机质含量不高且有所下降。

The 2nd national soil survey shows the main problems with soil fertilizers in this area as follows : 1 . The low content of organic compounds keeps decreasing .

利用土壤普查和松散堆积物调查资料，对全县土壤和松散堆积物按成因类型和组成特征进行了面积统计。

Based on field survey data , an area , an area statistical analysis of soils and loose sediments for both of their genetic and compositional groups was made .

滑县第二次土壤普查以来进行四次土壤耕层养分调查的结果表明，耕层土壤养分含量总体呈上升趋势；

Since soil general survey for the second time in Huaxian County , the investigation results for four time on topsoil nutrients show that topsoil nutrients is wholly increasing trend ;

同时，还以第二次全国土壤普查数据为参照，分析了恩施市植烟土壤全氮和碱解氮含量的状况。

In addition , the second national soil survey data were used as reference to analyze the distribution of total nitrogen and available nitrogen content of the tobacco growing soil in Enshi .

分析表明，自第2次土壤普查以来，黑龙江省黑土区25个市县土壤有机质分别下降了1.43%～4.12%，平均每年下降0.06%～1.48%。

The analysis indicated the soil organic content in 25 counties decreased among 1.43 % - 34.12 % in average since 1980 , which means decreasing 0.06 % - 1.48 % per year .

参照全国第二次土壤普查资料，建立土壤属性数据库，包括土层次、土壤容重、土壤有效含水量等13个参数。

On the basis of the national second soil survey , thirteen parameters including soil layer , soil bulk density , and soil effective moisture content were collected and converted according to the model requirement .

为此，在利用土壤普查、农业区划等调查资料的基础上，结合我们近年来中药材研究取得的成果，研制构建了商洛中药材种植土壤肥料信息系统。

Therefore , based on the data of soil survey , agricultural regionalization , etc. And combine with our research achievements of Chinese medicinal material recent years . The soil and fertilizer information system are constructed and developed .

运用多源遥感数据，获得常熟市1984、1992、1999和2001年四个时期城镇建设用地状况矢量数据。利用土壤普查资料建立土壤空间和属性数据库。

Using multi-source remote sensing data , four vector maps of expanding towns of Changshu City from 1984 to 2001 are acquired , and a soil database is constructed based on the Second Soil Survey of study area .

本系统首先将土壤普查数据以数据库的形式加以保存，分别建立了土壤属性数据库、行政编码库和配方施肥参数库三个数据库。

The soil attribute database system was built with database technology . The data were classified , transformed and saved in the form of database . Soil attribute database , administrative code database and parameter database for prescription fertilization were set up .

根据《全国第二次土壤普查数据》，中国水耕地土壤的有机碳含量平均是旱耕地的137%，水稻土水耕熟化过程中有机碳的积累是普遍趋势。

According to the second national soil survey data , the Chinese water organic carbon content of cultivated soil is dry an average of 137 % of cultivated land , paddy soil during the maturation hydroponics organic carbon accumulation is a common trend .

本文在该县土壤普查和室内土壤分析研究的基础上，认为该县大部分丘陵山地土壤应属于黄红壤&富铝化土壤中红壤土类的一个亚类。

On the basis of soil survey and study in laboratory of the representative soil profiles we found that most of the soils on hilly land should be classified as the Yellow-Red Earth , a subgroup of the Red Earth under alli-tic soil order .