Study On Soil Organic Carbon Of Black Soil Of Heilongjiang Province

Black soil is the main farming soil in Heilongjiang Province, soil organic carbon content is often considered to evaluate the quality of agricultural soil is an important indicator of a large loss of soil organic carbon can cause soil degradation and reduced agricultural land use sustainabilit.The pilot area is located in the Heilongjiang Province typical black earth area Nenjiang, Hailun, Suihua, Shuangcheng four regions, through the open country investigation, the sampling analysis and the acquisition of information, studies in this black earth area the component organic carbon reciprocity and the carbon reserves. Each research region sampling thirty spots, each sampling point selects stochastically, takes the 0~20cm surface layer soil three spot biased sample, each place selects six to have the representative sampling point to carry on three samples, the sample depth is respectively 0~20cm,20~40cm and 40~60cm.The result showed that the surface layer soil ulmin average content is Nenjiang > Halun> Suihua > Shuangcheng, the organic content is from north to south getting more and more low. The black earth total organic carbon content content along with the latitude the tendency which increases presents elevates gradually. The black earth organic archery target soil profile vertical distribution characteristic is, at the soil mantle organic matter accumulation, the content is high, the surface layer following presents the drop the tendency, presents the consistent tendency in the black earth zones of different. Four place 20~40cm soil average content for the Nenjiang > Hailun > Suihua > Shuangcheng, the organic content reduces gradually from north to south.Four place 40~60cm soil average content for the Nenjiang > Hailun > Suihua > Shuangcheng, the organic content reduces gradually from north to south. The lower level soil ulmin content change rule and the surface layer are the same, indicate these four place organic content, in the nature becomes the rule which under the earth factor function has reduces gradually from north to south.Four place's active organic content's mean value is Hailun > Suihua > Nenjiang > Shuangcheng, the distributed rule and is always organic the archery target distributed rule to be different, is not remarkable with the total organic matter relevance. the pH mean value for Shuangcheng > Suihua > Hailun > Nenjiang, the pH content reduces gradually from south to north, the acidity increases gradually, has the acidified tendency from south to north.Other, the surface layer soil free state light group organic carbon average content for the Nenjiang > Hailun >Suihua > Shuangcheng, assumes the extremely remarkable relevance with the total organic carbon content; The surface layer soil shuts gathers condition the light group organic carbon average content difference to be very small, is different with the total organic carbon distributed rule, does not have the relevance with the total organic carbon content; The soil free state light group organic carbon (fLF) the content increases along with the soil profile depth reduces, is the same with the soil total organic matter change rule, the soil shuts gathers condition the light group organic carbon (OLF) the content not to have the rule along the soil profile downward distribution, the distribution to have randomness; The surface layer soil reorganization organic carbon average content for Nenjiang > Hailun > Suihua > Shuangcheng, four place surface layer soil reorganization organic carbon content and the total organic carbon content assumes the extremely remarkable relevance. The lower level soil reorganization organic carbon (HF) the content increases along with the soil profile depth reduces.Four place's organic inorganic compound above 70%, the compound light group only has not had mostly a small part, indicated that this local black earth organic matter the humification degree is very high and mostly compound forms the organic inorganic complex with the inorganic colloid.The surface layer carbon density mean value for Nenjiang > Hailun > Suihua > Shuangcheng, studies the region surface layer soil the organic carbon density to have the high spatial changeability, the soil organic carbon density portion is non-uniform, entire research area organic carbon density. Assumes the tendency which from north to south decreases progressively gradually.