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首页> 外文期刊>Plant and Soil >Lifetime and temporal occurrence of ectomycorrhizae on ponderosa pine (Pinus ponderosa Laws.) seedlings grown under varied atmospheric CO2 and nitrogen levels.
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Lifetime and temporal occurrence of ectomycorrhizae on ponderosa pine (Pinus ponderosa Laws.) seedlings grown under varied atmospheric CO2 and nitrogen levels.

机译：在变化的大气CO2和氮水平下生长的黄松松树上的根外生菌根的寿命和时间变化。

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摘要

Ponderosa pine (Pinus ponderosa) seedlings were grown under three levels of atmospheric CO2 (ambient, 525 or 700 鎚ol CO2 mol-1) and three levels of annual nitrogen additions (0, 100 or 200 kg N ha-l) in open-top chambers. Every two months for 18 months, ectomycorrhizal root tips were observed using minirhizotron tubes and a minirhizotron camera. The numbers of new mycorrhizal root tips, the numbers of tips that disappeared between two consecutive recording events, and the standing crop of tips ateach event were determined. More mycorrhizal tips of all three categories were observed during the summer than at other times of the year. When only the standing crop of mycorrhizal tips was considered, effects of the CO2 and N treatments on carbon allocation to mycorrhizal tips were weakly evident. However, when the three categories of tips were considered collectively, flux of carbon through mycorrhizae was greatest in the 700 鎚ol CO2 treatment and the 100 kg N treatment. A survival analysis of the entire 18 month cohort of tips showed that the median lifetime of the mycorrhizal root tips was 139 days and was not affected by nitrogen or CO2 treatments.
机译：黄松（Pinus pokerosa）幼苗在三个水平的大气CO2（环境，525或700锤酚CO2 mol-1）和三个水平的年度氮添加量（0、100或200 kg N ha-1）下生长顶室。每隔两个月（共18个月），使用微型根管导管和微型根管照相机观察到根外ectomy根尖。确定了新的菌根根尖的数量，在两个连续记录事件之间消失的根尖的数量，以及每个事件中根尖的固定数量。在夏季观察到的所有这三种类别的菌根提示都比一年中的其他时间更多。当仅考虑种植菌根尖端时，CO2和N处理对菌根尖端碳分配的影响几乎没有。但是，当综合考虑这三类技巧时，在700锤酚CO2处理和100 kg N处理中，通过菌根的碳通量最大。对整个18个月的针尖队列进行的生存分析表明，菌根根尖的中位寿命为139天，不受氮或CO2处理的影响。

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