ข้อมูลงานวิจัย

กายภาพและสิ่งแวดล้อมกายภาพ

Correlations between soil microbial and physicochemical variations in a rice paddy: implications for assessing soil health

ความสัมพันธ์ระหว่างจุลินทรีย์ในดินและความแปรผันของเคมีกายภาพในนาข้าว: นัยสำหรับการประเมินสุขภาพของดิน

Journal of Biosciences

The paddy fi eld is located in Udom Sup Village, Wang Nam Kiao District, Nakhon Ratchasima Province, Thailand

2009/2552

2005-2005

บทความ

ฉบับสมบูรณ์

กายภาพและสิ่งแวดล้อมกายภาพ

Bacterial and physicochemical datasets; multivariate analysis; Rhizoctonia solani; rice paddy

This study was conducted to test the hypothesis that spatial variations in soil microbial variables in a Thai rice paddy are accurately described by multivariate profi les of the soil bacterial communities. We found that community-level physiological profi les of soil bacterial communities could better describe the population density of Rhizoctonia solani in soil than the physicochemical profi les do. However, soil dehydrogenase levels were closely correlated with soil fertility (P<0.05), and these were better described by the physicochemical profi les. Hence, the hypothesis was rejected, and we suspect that soil microbial variables react differently to the same physicochemical changes. The average population density of R. solani (35 colony-forming units/g dry soil) was relatively high in the soil we studied, and the soil fertility was found to be among the poorest in Thailand. The soil quality was comparable to the most degraded bare ground soil in an adjacent bioreserve in terms of Shannon diversity index based on the communitylevel physiological profi le as well as values of soil fertility indices. Overall, the soil microbial and physicochemical indicators showed that the paddy soil needs to be supplemented with soil nutrients. Otherwise, R. solani may cause a signifi cant reduction in rice production.

Doi, R., & Ranamukhaarachchi, S. L. (2009b). Correlations between soil microbial and physicochemical variations in a rice paddy: implications for assessing soil health. Journal of Biosciences, 34(6), 969.

Ryoichi Doi(เรียวอิจิ ดออิ) Senaratne Leelananda Ranamukhaarachchi(เสนารัตน์ ลีลานันทน์ ราณามุคราชชี)