CAJ | 학술논문

植物产生的脱落酸（ABA）可进入土壤并在土壤溶液中保持一定浓度，对植物生长、种子萌发、群落组成和演替具有重要意义。研究土壤ABA的分解过程有助于了解ABA在土壤中的循环过程，揭示土壤ABA和植物生长的相互关系。以广东南岭小坑常绿阔叶林为研究对像，分析了土壤理化性质和土壤ABA质量浓度的关系，并通过室内培养法结合灭菌处理研究土壤ABA的分解过程和土壤微生物在ABA分解过程中的作用。结果表明，土壤ABA质量浓度在29.8~167.0 ng·mL-1间，均值为91.5 ng·mL-1，且存在较大的空间异质性；土壤全N含量和ABA质量浓度存在正相关关系；在培养过程中，土壤微生物能够在短时间内（7 d）快速分解掉平均33.5%的土壤ABA，之后土壤ABA缓慢线性自然分解，分解速率平均为0.24%·d-1；在前期快速分解过程中，土壤ABA含量和分解速度间存在正相关关系，而在后期缓慢分解过程中则是负相关关系；土壤微生物一方面可以造成土壤ABA的快速分解，另一方面还具有防止土壤ABA质量浓度过低的作用。
식물산생적탈락산（ABA）가진입토양병재토양용액중보지일정농도，대식물생장、충자맹발、군락조성화연체구유중요의의。연구토양ABA적분해과정유조우료해ABA재토양중적순배과정，게시토양ABA화식물생장적상호관계。이엄동남령소갱상록활협림위연구대상，분석료토양이화성질화토양ABA질량농도적관계，병통과실내배양법결합멸균처리연구토양ABA적분해과정화토양미생물재ABA분해과정중적작용。결과표명，토양ABA질량농도재29.8~167.0 ng·mL-1간，균치위91.5 ng·mL-1，차존재교대적공간이질성；토양전N함량화ABA질량농도존재정상관관계；재배양과정중，토양미생물능구재단시간내（7 d）쾌속분해도평균33.5%적토양ABA，지후토양ABA완만선성자연분해，분해속솔평균위0.24%·d-1；재전기쾌속분해과정중，토양ABA함량화분해속도간존재정상관관계，이재후기완만분해과정중칙시부상관관계；토양미생물일방면가이조성토양ABA적쾌속분해，령일방면환구유방지토양ABA질량농도과저적작용。
Abscisic acid (ABA), a hormone synthesized by plants, can enter the soil solution and affect plant growth, seed germination, community composition and succession. Understanding the decomposition process of ABA in soil can help us to reveal the circulation of ABA in soils and its implication on plant growth. Soils were collected from an evergreen broadleaf forest in Xiaokeng, Nanling moutians, and soil physical and chemical properties and ABA concentration were measured. Additionally, an incubation experiment was conducted to measure soil ABA decomposition rate and the role of soil microorganism play in this process. Results showed that the concentration of ABA in soil solution was heterogeneous in space ranging from 29.8 ng·mL-1 to 167.0 ng·mL-1 (averaged at 91.5 ng·mL-1), and positively correlated with soil total nitrogen. About 33.5%of soil ABA was quickly decomposed by soil microorganisms during the first week of incubation, and then was decomposed slowly and linearly with a decomposition rate of about 0.24% per day afterwards. Soil ABA concentration and decomposition rate was positively correlated during the initial fast-decomposition period but was negatively correlated at the late slow-decomposition period. Soil microorganisms accelerated ABA decomposition on one hand and avoided the depletion of ABA in soil on the other hand.