Carbon and nitrogen transformations in New Zealand plantation forest soils from sites with different N status
Carbon and nitrogen transformations in New Zealand plantation forest soils from sites with different N status
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DOI：
10.1139/x98-067
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发表时间：
1998-07
影响因子：
2.2
通讯作者：
N. Scott;R. Parfitt;D. J. Ross;G. Salt
中科院分区：
文献类型：
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作者：
N. Scott;R. Parfitt;D. J. Ross;G. Salt
土壤养分循环过程之间的相互作用可能会影响森林生态系统受到干扰后的氮损失。在340天的实验室培养期间，我们研究了三种不同氮素状况的辐射松人工林采伐前沙地土壤中碳和氮的转化。土壤为高氮性土壤(溪水中流失的氮素)和肥力和未肥力的土壤。与其他森林生态系统不同的是，-N在所有矿质土壤和安迪索尔森林地面中很容易积累，但在施肥和未施肥的Entisol森林地面上分别直到第63天和210天才积累。然而，在两个Entisol处理中，总硝化从第42天开始发生。当底物C/N比降至40左右时，Entisol森林地面的净硝化作用就开始了，这可能是由于C有效性降低、对-N和-N的竞争减少以及微生物C/N比降低所致。碳和总氮矿化率(单位碳…
Interactions between soil nutrient cycling processes are likely to influence N losses following disturbance in forest ecosystems. During a 340-day laboratory incubation, we examined C and N transformations in three sandy soils of different N status from Pinus radiata D. Don plantations before clear-cutting. The soils were a high N status Andisol (losing -N in streamwater) and a fertilized and unfertilized Entisol. In contrast to other forest ecosystems, -N accumulated readily in all mineral soils and in the Andisol forest floor but did not accumulate until day 63 and 210 in the fertilized and unfertilized Entisol forest floor, respectively. However, gross nitrification occurred from day 42 in both Entisol treatments. Net nitrification in the Entisol forest floor began when substrate C/N ratio declined to about 40, possibly because of decreased C availability and decreased competition for both -N and -N in conjunction with a lower microbial C/N ratio. Carbon and gross N mineralization rates (per unit of C ...