火山灰土

两地土壤的pH值及磷酸吸收系数均较高，具有国外火山灰土的特性。中国的火山灰土

The pH ( NaF ) and the phosphate retention were high . VOLCANIC ASH SOILS IN CHINA

本文对长白山、五大连池火山灰土的剖面形态特征、颗粒组成、化学性质及腐殖质形态进行了初步研究。

The morphological characteristics , particle distribution , chemical properties and humic substance were examined in the present paper .

长白山火山灰土的表层有机质腐殖质含量较高、全氮量丰富、全磷量缺少。

CHANGBAI Mountain volcanic ash soils humus layer with higher levels of organic matter , all rich in nitrogen , total phosphorus is missing .

反映了长白山火山灰土的化学性质决定在于有机大分子，酸度和元素这三个因子。

Reflect the chemical nature of the CHANGBAI Mountain volcanic ash soils is determined organic macromolecules , acidity , and elements of these three factors .

火山灰土在土壤硝化中的土壤水分含量以田间持水量的75%～90%较为适宜，低于田间持水量的75%引起土壤硝化力降低。

The nitrification activity decreased when soil water contents lower than 60 % and 75 % of ( WHC ) both for Chinese Chao soil and Japanese andisol respectively .

这与传统上对火山灰土的认识并不完全一致。（3）从相关分析中可以看出，长白山火山灰土的各种化学性质相互影响。

There is not entirely consistent between the study and traditional understanding of the volcanic ash soils . ( 3 ) Can be seen from the correlation analysis , chemical properties of soil in CHANGBAI Mountain ash influence each other .