Regulation of soil phosphatase and chitinase activity by N and P availability
Regulation of soil phosphatase and chitinase activity by N and P availability
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DOI：
10.1023/a:1006316117817
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发表时间：
2000-05-01
期刊：
影响因子：
4
通讯作者：
Vitousek, PM
中科院分区：
文献类型：
--
作者：
Olander, LP;Vitousek, PM
土壤微生物和植物产生的酶矿化有机结合的养分。当养分供应量低时，生物群可能能够增加这些酶的产量，以提高无机氮（N）和磷（P）的供应。酶生产的调节可能是N和P循环相互作用的一个点。我们在夏威夷的土壤中测定了酸性磷酸酶和几丁质酶（N-乙酰β-D-氨基葡萄糖苷）的活性。几丁质酶活性下降显着的年龄和N的可用性增加整个时序。磷的加入抑制了磷酸酶活性在所有网站，而氮的加入增加磷酸酶活性在年轻的，N-有限的网站。与此相反，N除了抑制几丁质酶活性仅在N有限的年轻网站，和P添加几丁质酶活性没有影响。这些结果表明，养分供应和养分矿化之间的监管关系是不对称的N和P，和差异可能有助于解释观察到的N和P的可用性模式的差异。
Soil microorganisms and plants produce enzymes that mineralize organically bound nutrients. When nutrient availability is low, the biota may be able to increase production of these enzymes to enhance the supply of inorganic nitrogen (N) and phosphorus (P). Regulation of enzyme production may be a point where N and P cycles interact. We measured acid phosphatase and chitinase (N-acetyl ss-D-glucosaminide) activity in soil across a chronosequence in Hawaii where N and P availability varies substantially among sites and long term fertilizer plots had been maintained for over 4 years.Phosphatase activity was high at all sites. Chitinase activity decreased significantly as age and N availability increased across the chronosequence. Phosphorus addition suppressed phosphatase activity at all sites, while N addition increased phosphatase activity at the young, N-limited site. In contrast, N addition repressed chitinase activity only at the N limited young site, and P additions had no effect on chitinase activity. These results suggest that the regulatory relationship between nutrient supply and nutrient mineralization are asymmetric for N and P, and that the differences could help to explain differences observed in patterns of N and P availability.