土壤微生物活性对林地土壤磷有效性的影响
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Effects of Soil Microorganism Activity on Bioavailabily of Phosphorus
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    摘要:

    以苏格兰Balmacarc地区栎树林为对象,研究了林地微生物及磷酸酶活性对土壤磷的生物有效性的影响。结果表明:在一定条件下,土壤微生物活性与磷酸酶活性呈正相关,两者在距根表不同距离呈梯度分布;在林木生长旺盛的夏季磷酸酶活性达到高峰。本研究还通过对土壤不同磷库的逐级测定,探讨了磷的生物有效性与微生物及磷酸酶活性的关系。当加入有机物后(作为微生物生活能量),发现土壤有效磷的组分有相应的变化。本文以0.1MNaOH提取的磷作为识别有效磷总量的界限,并尝试了插管法,以测定圈内外吸收差,初步测得林地中生物有效磷为总有效磷的36%。

    Abstract:

    Bioavailability of phosphorus in oak forests in Scotland was studied mainly by examining theeffects of activities of microbials and phosphates in forested soil. The results indicated that therewas a close correlation between activity of soilmicrobials and that of phosphates. Both activitiesshowed gradient changes in range of distances from fine roots. The activity of phosphates reachedpeak in summer as trees grew into the most vital period. Through a fractionation scheme of ex-tracting phosphorus ranged from labile to stable pools in soil, an attempt was made to explore therelationship between bioavailability of phosphorus and activities presented by soilmicrobials andphosphates. After adding organic matter into soil as energy for microbials, it was found that vari-ous fractions had corresponding change in contents of available P. 0. 1 M NaOH was used as ex-tractant to identify size of available P. A fresh design of pressing down tube cutting into soil wasput on trial for determination f difference in takeup-P between parts of soil inside and outside oftube. Based on the method, bioavailable P was determined to be about 36%, compared to totalavailable P in oak forest soil.

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