Decomposition of Dairy Manure Assessed in the Field by Monitoring Natural Abundance of C-13

作者：Carpenter Boggs Lynne A; Carlson Bryan R; Higgins Stewart S^*; Stoeckle Claudio O

来源：Soil Science Society of America Journal, 2014, 78(6): 1949-1952.

DOI：10.2136/sssaj2014.02.0079n

Decomposition rate constants, k, for organic amendments in soil are generally determined from laboratory incubations. Whether these incubations can be extrapolated to field conditions is an open question. Reliable decay constants are necessary to predict the C sequestration potential of organic soil amendments. We applied fresh dairy manure from corn (Zea mays L. subsp. mays.)-fed cows to sandy loam soil to characterize the decomposition and retention of manure under dryland field conditions. The delta C-13 of amended soil was analyzed over 114 d to determine k of the manure. The resulting k was 0.0642 d(-1). At this rate, about 1% of the manure C remained in the soil after 10 wk. Literature reports of k for cattle manure from laboratory incubations bracketed our results. The use of native isotope abundance permitted the study of amendment decomposition under field conditions within a growing season and indicated that dairy manure contributed little to long-term soil C storage.

• 出版日期2014-12