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Calcium requirement of quaking aspen...

Lu, Erh-Yang,

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Calcium requirement of quaking aspen (Populus tremuloides Michx.) seedlings /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Calcium requirement of quaking aspen (Populus tremuloides Michx.) seedlings // Erh-Yang Lu.
作者:	Lu, Erh-Yang,
面頁冊數:	1 electronic resource (191 pages)
附註:	Source: Dissertations Abstracts International, Volume: 61-12, Section: B.
Contained By:	Dissertations Abstracts International61-12B.
標題:	Forestry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9946991
ISBN:	9780599491526

Calcium requirement of quaking aspen (Populus tremuloides Michx.) seedlings /
Lu, Erh-Yang,

Calcium requirement of quaking aspen (Populus tremuloides Michx.) seedlings /Erh-Yang Lu. - 1 electronic resource (191 pages)

Source: Dissertations Abstracts International, Volume: 61-12, Section: B.

To evaluate potential effects of Ca depletion on aspen productivity, I undertook a series of hydroponic and soil experiments to determine the levels of solution Ca required to achieve maximum growth in aspen seedlings and to examine other solution elements that influence the Ca requirement. Results from nine hydroponic experiments are summarized here. Growth increased with solution Ca. Ninety percent of maximum elongation occurred at 61 μM for shoots and 88 μM for roots. Tissue Ca increased with solution Ca. Shoot and root elongation was positively correlated with tissue Ca. Ninety percent of maximum shoot elongation occurred at leaf Ca 0.46% (ODW) and root Ca 0.12%, and 90% of maximum root elongation at leaf Ca 0.56% and root Ca 0.13%. At 25 and 250 μM Ca, growth increased with solution pH (3.3 to 5.0). The need for solution Ca was higher at lower solution pH. Tissue Ca increased with solution pH. High solution Mg reduced growth at low solution Ca. High solution NH 4 reduced root elongation at both 10 and 250 μM Ca. The need for solution Ca increased at higher solution Mg or NH4. Ninety percent of maximum elongation occurred at solution Ca/Mg molar ratio of 0.14 for shoots and 0.53 for roots, and 90% of maximum root elongation at solution Ca/NH 4 molar ratio of 2.44. High solution Mg and NH4 reduced tissue Ca. Growth decreased with increasing solution Al and increased with solution Ca/Al. Ninety percent of maximum elongation occurred at solution Ca/Al molar ratios of 0.23 for shoots and 1.86 for roots. Solution Al reduced tissue Ca. Shoot elongation was positively correlated with root Ca/Al, and root elongation with root Ca. Ninety percent of maximum shoot elongation occurred at root Ca/Al weight ratio of 0.40, and 90% of maximum root elongation at root Ca 1.4%. The reported soil solution Ca levels in Lakes States aspen forests are higher than those associated with Ca deficiency in my hydroponic experiments.

English

ISBN: 9780599491526Subjects--Topical Terms:

895157
Forestry.
Subjects--Index Terms:

Calcium requirement

Calcium requirement of quaking aspen (Populus tremuloides Michx.) seedlings /
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520 $a To evaluate potential effects of Ca depletion on aspen productivity, I undertook a series of hydroponic and soil experiments to determine the levels of solution Ca required to achieve maximum growth in aspen seedlings and to examine other solution elements that influence the Ca requirement. Results from nine hydroponic experiments are summarized here. Growth increased with solution Ca. Ninety percent of maximum elongation occurred at 61 μM for shoots and 88 μM for roots. Tissue Ca increased with solution Ca. Shoot and root elongation was positively correlated with tissue Ca. Ninety percent of maximum shoot elongation occurred at leaf Ca 0.46% (ODW) and root Ca 0.12%, and 90% of maximum root elongation at leaf Ca 0.56% and root Ca 0.13%. At 25 and 250 μM Ca, growth increased with solution pH (3.3 to 5.0). The need for solution Ca was higher at lower solution pH. Tissue Ca increased with solution pH. High solution Mg reduced growth at low solution Ca. High solution NH 4 reduced root elongation at both 10 and 250 μM Ca. The need for solution Ca increased at higher solution Mg or NH4. Ninety percent of maximum elongation occurred at solution Ca/Mg molar ratio of 0.14 for shoots and 0.53 for roots, and 90% of maximum root elongation at solution Ca/NH 4 molar ratio of 2.44. High solution Mg and NH4 reduced tissue Ca. Growth decreased with increasing solution Al and increased with solution Ca/Al. Ninety percent of maximum elongation occurred at solution Ca/Al molar ratios of 0.23 for shoots and 1.86 for roots. Solution Al reduced tissue Ca. Shoot elongation was positively correlated with root Ca/Al, and root elongation with root Ca. Ninety percent of maximum shoot elongation occurred at root Ca/Al weight ratio of 0.40, and 90% of maximum root elongation at root Ca 1.4%. The reported soil solution Ca levels in Lakes States aspen forests are higher than those associated with Ca deficiency in my hydroponic experiments.
546 $a English
590 $a School code: 0130
650 4 $a Forestry. $3 895157
650 4 $a Soil sciences. $3 2122699
650 4 $a Botany. $3 516217
653 $a Calcium requirement
653 $a Populus tremuloides
653 $a Quaking aspen
653 $a Seedlings
690 $a 0478
690 $a 0481
690 $a 0479
710 2 $a University of Minnesota. $e degree granting institution. $3 3765849
720 1 $a Sucoff, Edward I. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 61-12B.
790 $a 0130
791 $a Ph.D.
792 $a 1999
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9946991