NITROGEN MINERALIZATION PATTERNS OF LEAF-TWIG MIXTURES FROM TROPICAL LEGUMINOUS TREES

被引：6

作者：

CONSTANTINIDES, M

FOWNES, JH

机构：

[1] Department of Agronomy and Soil Science, University of Hawaii, Honolulu, 96822, HI

来源：

AGROFORESTRY SYSTEMS | 1993年 / 24卷 / 03期

关键词：

ALLEY CROPPING; CALLIANDRA-CALOTHYRSUS; GLIRICIDIA-SEPIUM; GREEN MANURE; INCUBATIONS; NITROGEN MINERALIZATION; MULTIPURPOSE TREE;

D O I：

10.1007/BF00705623

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Green manure applications in alley cropping systems often include twigs despite their potential to absorb (immobilize) nitrogen (N). To assess the impact of twigs on net N mineralization or immobilization from hedge row cuttings, we separated cuttings from Calliandra calothyrsus and Gliricidia sepium into leaf-only, twig-only, and mixed (leaf + twig) fractions and incubated them with moist soil in the laboratory. Soil extractable inorganic N did not differ among treatments after two weeks, but after four and eight weeks was greatest in leaf-only, and least in twig-only treatments. After two weeks, extractable N from the leaf-only treatment rose steadily, while that from the twig-only and mixed treatments was variable due to periods of net mineralization and net immobilization. The pattern of variation in mixed treatments paralleled that of twig-only, indicating that net immobilization in the mixture was largely caused by the presence of twigs. Extractable N from the mixture was somewhat lower than that predicted from the sum of leaf-only and twig-only treatments. We conclude that twigs in green manure reduce short-term N availability to associated crops in agroforestry systems.

引用

页码：223 / 231

页数：9

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