查詢結果分析
來源資料
頁籤選單縮合
題 名 | Effects of Soils on the Micromorphological Changes of Compost-Derived Humified Substances |
---|---|
作 者 | 曾景山; 王敏昭; | 書刊名 | Taiwan Sugar |
卷 期 | 44:5 民86.09-10 |
頁 次 | 頁12-15 |
分類號 | 434.22 |
關鍵詞 | 腐植酸; 黃酸; 掃描電子顯微構造; 微型態學; Humic acid; Fulvic acid; Scanning electron micrograph; SEM; Micromorphology; |
語 文 | 英文(English) |
英文摘要 | Sustainable agriculture highly prioritizes the amandment of organic materials to soils. Therefore, this study investigated the effects of two soils on the micromorphological changes of humified substances derived from three organic materials. These organic materials were cattle manure, swine manure and refuse manure composts, which are commercialized and commonly used in farmlands. The two soils were the acidic diluvium red soil (Pinchen series) and the basic sandstone-shale calcareous alluvial soil (Chiapa series). The used composts and soils were air-dried, ground and, then, passed through a 2-mm sieve. Based on 6% of organic matter content, an exact amount of each compost was thoroughly mixed with that of soil to make up a total of eleven sets of treatment incubated in an incubator at 25 ℃. During the incubation period, deionized water was added to all treatments to maintain at 1/30 MPa of water tension. At the end of 0-, 8-, 24- and 48-week incubation periods, a replica of each set of the eleven treatments was taken from the incubator, air-dried, ground and passed through a 2-mm sieve. Then, according to the method recommended by the International Humic Substances Society (IHSS), each replica sample was subjected to extraction and purification of humic acid (HA) and fulvic acid (FA). Furthermore, the fulvic acid with a molecular weight exceeding 1,000 (FAL) of each purified fulvic acid was separated from that with less than 1,000 (FAS) by using dialysis tubing with a molecular weight cutoff of 1,000. Micromorphologies of the freeze-dried HA, FAL and FAS (as examined by scanning electron microscopy) revealed the micromorphological changes of the extractable humified substances during the incubation periods. The studied humified substances started from the accumulation of FAS to fragmental or fiber-like FAL and, then, blocky HA. Moreover, soil properties strongly influenced the micromorphological changes of the studied compost-derived humified substances. |
本系統中英文摘要資訊取自各篇刊載內容。