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首页> 外文期刊>Plant and Soil >Changes in phosphorus availability and nutrient status of indigenous forest fragments in Pastoral New Zealand Hill country
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Changes in phosphorus availability and nutrient status of indigenous forest fragments in Pastoral New Zealand Hill country

机译：新西兰牧区山地土著森林碎片的磷有效性和养分状况的变化

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Indigenous forest fragments in rural New Zealand are increasingly valued as reservoirs of native biodiversity. Most forest species are adapted to soils of low phosphorus (P) availability, but fragments are often intermingled with managed pastures and subjected to unintended P inputs from aerial topdressing, which may compromise their long-term sustainability. Phosphorus availability and other nutrients in forest fragments were compared with adjacent fertilised pasture and reference forest areas not receiving fertiliser additions. Inorganic (H2SO4 soluble) P and available (Olsen) P were approximately ten times greater in fragment forest soils than reference forest soils, while total P was two times greater. The strong linear relationship between total P and cadmium, an element contained in rock phosphate fertilisers, suggested that the increased P levels in fragment forests could be attributed to P from aerial topdressing. Comparison of foliar N:P ratios show that P is being conserved in reference forests but not in fragment forest. A 5-fold increase in P mineralisation rate in forest fragments high in available P and a significant relationship between total P in forests and soil respiration suggests P availability may be limiting microbial activity in these forest systems. Forest Fragments also had base saturation and Ca, Mg, and K levels twice that of reference forests. Increased nutrient levels have been shown to alter plant successional dynamics and community composition, and raise concerns over future successional patterns and long-term stability of these forest fragments. [References: 30]
机译：新西兰农村地区的原始森林碎片越来越被视为本地生物多样性的储藏地。大多数森林物种都适合低磷（P）的土壤，但是碎片经常与管理的牧场混杂在一起，并受到来自空中追肥的意外P投入，这可能会损害其长期可持续性。将森林碎片中的磷有效性和其他养分与邻近的未施肥的牧草和参考林进行了比较。零碎森林土壤中无机（可溶于H2SO4的）P和有效磷（Olsen）的P大约是参考森林土壤的十倍，而总P则大两倍。总磷与镉（磷矿石肥料中所含的一种元素）之间的强线性关系表明，零碎森林中磷的含量增加可能归因于空中追施磷。叶面N：P比值的比较表明，参考森林中的P被保存，而零碎森林中的P被保存。有效磷含量高的森林碎片中磷矿化速率提高了5倍，森林中的总磷与土壤呼吸之间存在显着关系，这表明磷的有效性可能会限制这些森林系统中的微生物活动。森林碎片还具有基本饱和度，并且Ca，Mg和K含量是参考森林的两倍。养分含量的增加已显示出会改变植物演替动态和群落组成，并引起人们对这些森林碎片未来演替模式和长期稳定性的关注。 [参考：30]

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