有机质含量

可见，土壤颗粒组成中粘粒含量和砂粒含量、土壤中有机质含量是影响PCBs分布的主要因素。

This result indicated the clay and sand contents of soil practical composition , the TOC content were the main influencing factors on the PCBs distribution .

施用除草剂使土壤有机质含量和土壤pH降低，但是增加了土壤速效养分含量。

Herbicide application decreased soil organic matter content and pH value , but increased the available N , P , K.

不同年龄Ⅰ-69杨和Ⅰ-72杨林地表层土壤全N、有机质含量随栽植代次增加而增加。

Total N and OM of the surface layer of different ages plantations increased with the increasing continuous cropping .

其主要影响因子为土壤质地、全量、pH值和有机质含量。

Soil texture , total contents , pH values and organic matters were the main factors influencing available micronutrients .

生草可以降低表层土壤容重，增加表层土壤有机质含量，提高土壤PH值。

Grass cover decreased bulk density of surface soil ; it also increased organic mater content and PH of surface soil .

有机质含量差异明显，为9.5-37.6g／kg；

Differences in the organic content were obvious , ranging between 9 . 50-37 . 6 g / kg ;

耕地与林地土壤的有机质含量相差50%左右，N、P等其他元素的含量相差约30%左右。

The difference on the content of organic matter and other nutrient elements such as N and P were around 50 % and 30 % respectively .

Cd、Pb在土壤中的分布与土壤的pH值，有机质含量密切相关。

The major factor which effect on the chemical forms of Cd , Pb in soils were pH and the organic content .

灰色关联分析结果显示，土壤有机质含量和土壤pH值分别与生境中土壤动物的个体数和类群数的关联度较大。

Grey correlation analysis revealed that soil organic matter and soil pH are significant factors which respectively affected soil fauna individual number and group number .

其次是较高的植被生态优势度、土壤中有机质含量和pH值，以及较差的土壤粒度分选性。

Secondly the higher ecological dominant degree of vegetation , pH values and organic matter contents in the soils , and the poorer sorting indices .

土壤pH值、碳酸盐含量、有机质含量以及土壤颗粒大小，均对土壤锰的形态分布有重要影响。

Soil properties ( soil pH , organic matter content , carbonate content and particle size ) have important influence on form distribution of soil Mn .

结果表明：1、窖泥中的各种成分与原建窖土壤和封窖泥均有较大差异，其中的N、P、K及有机质含量均远高于原建窖土壤。

The results show that ( 1 ) The chemical component content in cellar mud is much different compare with that in its original soil and its cover cellar mud .

综述了土壤有机质含量、pH值、主要营养元素等土壤肥力因素对烤烟叶片硝酸盐积累影响的研究概况。

Effects of some soil fertility indexes including content of organic matter , pH value and main nutrient elements on nitrate accumulation in flue-cured tobacco leaf were summarized .

结果表明，流动沙丘与其它植被类型相比土壤颗粒较粗，有机质含量贫乏，速效钾和pH也较低，但全氮和速效磷的含量却相对较高；

The soil of moving dune has coarser granule , more total nitrogen and available phosphorus , but less organic content , available kalium and lower pH value .

涝渍条件下黑杨派无性系基茎韧皮部的PAL活力和有机质含量

PAL activity and organic components in basal stem phloem of Poplar Clones under waterlogging and flooding condition

通过对试验地不同林分土壤性质及营养元素的测定，发现水曲柳落叶松混交林土壤pH值、有机质含量与水曲柳纯林无显著差异；

The soil pH and organic matter in ash and larch mixture plantation and ash monoculture varies lightly through measuring soil characteristics and nutrition element in the different stands ;

石灰土酶活性水平的高低受土壤pH值、有机质含量和吸湿水含量的影响。

Main conclusions were listed as the follows : ( 1 ) Lime soil enzyme activity was affected by soil pH value , organism content , and hygroscopic water content .

CK和PK处理在不同生育期其根际pH值均低于根外，且在所有处理中差别最大，土壤有机质含量是逐渐下降的。

The pH value of the CK and PK treatments were much lower in the rhizosphere than that in the bulk soil .

根区土壤多酚含量与土壤pH值、有机质含量、铅的化学形态和叶片铅吸附能力的相关关系显著。

Polyphenol content in the soil of root zone had significant correlation with soil pH , organic matter content , chemical species of lead , and lead adsorption capacity of leaf .

土壤要求有机质含量高，通气性好和水分充足而稳定的酸性沙质土壤，尤其对土壤酸性条件特别严格，最适宜的pH值为4.5～4.8。

Soil organic matter content high , the requirements and nitrogen-fixing enough moisture and stable acidic sandy soil , especially for soil acidity condition especially strict , optimum pH value was 4.5-480 .

游憩活动导致土壤容重增加，土壤孔隙度、水分含量、有机质含量和PH值降低。

Because of the outdoor recreation , the bulk density of soil increases . And the soil moisture , soil porosity , the percentage of soil organic material , the pH-value descend .

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 .

以年内烟&稻复种连作为主的湘南烟区，土壤pH偏高，有机质含量高，但有机质中腐殖质的比例较低；

In the South of Hunan with cigarette-rice multiple cropping , the pH is medium and high , the organic matter is high , but the humus content is low in the organic matter ;

与杉木林地相比，自然更新林地的pH值、有机质含量和营养元素含量增加的程度更为显著。

Compared with the Chinese fir plantation , the increasing range of the pH value , the organic matter contents and nutritional element contents in naturally regenerated woodland increase to a more obvious degree .

人工基质因有机质含量较高，故其碱解氮最大（106.9mgkg-1）。

Artificial substrate for the higher organic matter content , so the maximum nitrogen ( 106.9 mg kg-1 ) .

土壤有机质含量和CEC是影响供试土壤Cu2+吸附量的主要因素。

Organic matter content and CEC are the two major factors affecting soil Cu ~ ( 2 + ) adsorption .

试验得到的主要结论为：（1）日光温室土壤有机质含量随日光温室栽培年限的增加而增加，日光温室土壤pH值低于农田土壤。

The conclusions were as follows : ( 1 ) The content of organic matter increased with the years of greenhouse , and pH of soil in greenhouse was lower than that of field soil .

一般沉积物粒度由粗到细，有机质含量由低到高，OC，N，P的含量递增，S和Si含量递减。

In general , the finer the grain size has , the higher the contents of organic matter and OC , N , P and the lower the contents of S and Si .

铊在土壤和沉积物中的存在形态与土壤和沉积物自身的理化性质如土壤类型、pH值、有机质含量等有一定的关系。

The fractions of thallium in the soils and sediments were related to the physical and chemical properties of soils and sediments themselves such as soil types , pH and organic matter to a certain extent .

土壤颗粒组成状况显著地影响土壤的速效磷、速效钾、浸水容重、吸湿率、烧失率、pH值等，对土壤紧实度、有机质含量也有一定的影响。

The forest soils particle size composition notability affected validity phosphorous , validity potassium , soggy density , hygroscopic water , ignition loss and pH. Influence also takes place in soil compactness and organism in some extent .