不同土地管理下原钙质黑钙土的溶解有机质和微生物碳

Q4 Agricultural and Biological Sciences Biulleten'' Pochvennogo instituta im VV Dokuchaeva Pub Date : 2022-11-25 DOI:10.19047/0136-1694-2022-112-122-133
V. A. Kholodov, Y. Farkhodov, N. V. Yaroslavtseva, N. Danchenko, B. Ilyin, V. I. Lazarev
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引用次数: 0

摘要

水可提取有机质是土壤碳最活跃、最具流动性的形式。另一种活性组分是微生物的碳成分,具有极高的生物活性。这两种组分在我们星球上的农产品和全球碳循环中都发挥着重要作用。这项工作的目的是估计不同土地利用类型的典型黑钙土(原钙化黑钙土)中水可提取有机物的碳含量以及微生物来源的碳含量。对从不同类型土地利用的长期试验田中采集的原钙黑钙土样品进行了调查:55年的永久裸休耕(自1964年以来);常规耕作——四田轮作,第一轮轮作;直播-类似于直播的作物轮作,第一轮;经过34年的休耕(自1964年以来),休耕21年(自1998年以来)。我们测定了水可提取有机物的碳含量和微生物来源的碳含量。在所研究的一系列变体中,水可提取有机物的碳在上层(0–15 cm)有机物总量中的比例分别为0.69%、0.85、1.01和0.98%,而微生物来源的碳为0.27、0.55、0.53,和1.52%。值得注意的是,在直播变体中总有机碳含量增加的背景下,与传统土壤处理相比,该变体中的微生物生物量没有增加。与所有其他类型的土地利用不同,休耕变体的特点是微生物碳的比例更高,而水可提取有机物的碳比例更高。
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Dissolved organic matter and microbial carbon of Protocalcic Chernozems of different land management
Water-extractable organic matter is the most active and mobile form of soil carbon. The other active fraction and extremely biolabile is the carbon constituent of microorganisms. Both of these fractions play an essential role in agrocenoses and in the global carbon cycle on our planet. The aim of the work was to estimate the carbon content of water-extractable organic matter as well as that of microbial origin in typical chernozems (Protocalcic Chernozems) of different land-use types. Protocalcic Chernozem samples taken from the fields of long-term experiments with different types of land use were investigated: a permanent bare fallow for 55 years (since 1964); conventional tillage – four-field crop rotation, first rotation; direct seeding – crop rotation similar to direct seeding, first rotation; a 21-year fallow (since 1998) after 34 years of bare fallow (since 1964). We determined the carbon content of water-extractable organic matter and the carbon content of microbial origin. In the studied series of variants, the proportion of carbon of water-extractable organic matter in the total amount of organic matter in the upper horizon (0–15 cm) was 0.69, 0.85, 1.01, and 0.98%, respectively, while that of carbon of microbial origin was 0.27, 0.55, 0.53, and 1.52%. It was noted that against the background of increasing the content of total organic carbon in direct seeding variant, compared with the traditional soil treatment, the microbial biomass in this variant does not increase. The fallow variant, unlike all other types of land use, is characterized by a higher proportion of microbial carbon, in contrast to the carbon of water-extractable organic matter.
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来源期刊
CiteScore
0.90
自引率
0.00%
发文量
15
审稿时长
8 weeks
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