7种入侵植物养分、纤维含量测定及其分解速率

N. Hewavitharana, S. Kannangara, L. Jayasekera, P. Weerasinghe
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摘要

分析了7种入侵植物(薇甘菊(Mikania scandens)、金叶铁(Tithonia difolia)、山楂花(Lantana camara)、三叶油藻(Sphagneticola trilobata)、臭草(Chromolaena odorata)、含羞草(Mimosa pigra)和大头草(Panicum maximum))的营养成分(C、N、P、K、Mg、Ca、Cu、Fe、Mn和Zn)、纤维含量和分解速率,以期为作物栽培制备具有成本效益的有机堆肥。采用凋落物袋法测定分解速率。养分含量显著最高;其中N(3.44%)、Mg(1.3%)、Cu (34 Mg kg)、Fe (393 Mg kg)、Mn (150 Mg kg)和Zn (671 Mg kg)含量最高。不同品种的白头草P(0.37%)和Ca(4.92%)含量显著高于其他品种。三叶草的钾含量显著高于其他植物(4.32%)。有机碳含量(16.8%)、粗纤维含量(4.85%)和粗纤维含量(3.50%)以及C:N比(4.8和6.1)均显著低于山楂和山楂;腐解率在scandens (k= 12.91 /年)和tafolia (k= 10.77 /年)中显著较高。虽然最大p的养分含量和分解速率(k= 3.41 /年)显著低于其他品种,但其碳含量(33.7%)、粗纤维含量(20.42%)和C:N比(26.5)显著高于其他品种。由于其相对较高的营养和分解速率,金合欢和金合欢有潜力用于低成本的有机堆肥制备。由于其粗纤维含量较高,也可加入堆肥中,以改善土壤的物理性质。
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Determination of nutrients and fiber contents of seven invasive plants and their decomposition rates
Nutrients (C, N, P, K, Mg, Ca, Cu, Fe Mn and Zn), fiber contents and decomposition rates of seven invasive plants (Mikania scandens, Tithonia diversifolia, Lantana camara, Sphagneticola trilobata, Chromolaena odorata, Mimosa pigra and Panicum maximum) were analyzed aiming at their potentiality to prepare cost effective, organic compost for crop cultivation. Litter bag technique was used to measure the decomposition rates. Significantly the highest nutrient contents; N (3.44%), Mg (1.3%), Cu (34 mg kg), Fe (393 mg kg), Mn (150 mg kg) and Zn (671 mg kg) were found in M. scandens. T. diversifolia had significantly higher P (0.37%) and Ca (4.92%) contents than that of others. S. trilobata showed significantly higher K content (4.32%). Whereas, M. scandens and T. diversifolia showed significantly lower organic carbon contents (16.8% and 19.8%), crude fiber contents (4.85% and 3.50%) and C:N ratio (4.8 and 6.1) respectively. Significantly higher decomposition rates were observed in M. scandens (k= 12.91 per year) and T. diversifolia (k= 10.77 per year). Although the nutrient contents and decomposition rate (k= 3.41 per year) in P. maximum were significantly lower, but its carbon (33.7%), crude fiber content (20.42%) and C:N ratio (26.5) were significantly higher than that of others. T. diversifolia and M. scandens have the potential to use in low cost organic compost preparation, due to their comparatively higher nutrients and decomposition rates. P.maximum can also be incorporated in preparing compost for its higher crude fiber content to improve the soil physical properties.
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