Abstract
Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany, as well as in other declining P. abies stands in southern Germany, was associated with a decrease in the concentrations of both chlorophyll a and b, and, to a lesser extent, of carotenoids. Needle chlorosis related more to a decrease in the chlorophyll concentration than to a decrease in the ratio of total chlorophyll to carotenoids. In forests growing on relatively acidified soils, concentrations of both chlorophyll a and b, and of carotenoids in chlorotic needles were related only to foliar magnesium concentration. In forests growing on more alkaline soils, chlorophyll concentration increased with potassium and phosphorus concentrations and decreased with calcium and magnesium concentrations. Green needles from a declining site in northeast Bavaria were also compared with those from a nearby healthy site. The chlorophyll concentrations in needles increased more at the healthy site than at the declining site during the growing season and with increasing needle age as predicted by a nutritional disharmony model. The use of foliar chlorophyll and nutrient analyses of needles representing a range in severity of chlorosis is proposed as a quick method of identifying the soil processes which, in some areas, cause forest decline.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Needle chlorosis related more to a decrease in chlorophyll concentration than to a decrease in the total chlorophyll to carotenoid ratio.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e2“Needle chlorosis related more to a decrease in the chlorophyll concentration than to a decrease in the ratio of total chlorophyll to carotenoids”
Claim · model-written summary
Chlorophyll a and b concentrations decreased with increasing needle chlorosis at a declining site in northeast Bavaria.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e1“was associated with a decrease in the concentrations of both chlorophyll a and b, and, to a lesser extent, of carotenoids”
Claim · model-written summary
Carotenoid concentrations decreased to a lesser extent than chlorophyll a and b with increasing needle chlorosis.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e1“was associated with a decrease in the concentrations of both chlorophyll a and b, and, to a lesser extent, of carotenoids”
Claim · model-written summary
On relatively acidified soils, chlorophyll a and b concentrations in chlorotic needles were related only to foliar magnesium concentration.
- Taxon
- Piceaabiese0
- Compound
- foliar magnesium concentratione3
- Outcome
- concentrations of both chlorophyll a and be3
- Setting
- relatively acidified soilse3
Not reportedDirection
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e3“In forests growing on relatively acidified soils, concentrations of both chlorophyll a and b, and of carotenoids in chlorotic needles were related only to foliar magnesium concentration”
Claim · model-written summary
On more alkaline soils, chlorophyll concentration increased with potassium and phosphorus concentrations.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e4“In forests growing on more alkaline soils, chlorophyll concentration increased with potassium and phosphorus concentrations and decreased with calcium and magnesium concentrations”
Claim · model-written summary
On more alkaline soils, chlorophyll concentration decreased with calcium and magnesium concentrations.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e4“In forests growing on more alkaline soils, chlorophyll concentration increased with potassium and phosphorus concentrations and decreased with calcium and magnesium concentrations”
Claim · model-written summary
Chlorophyll concentrations in needles were higher at the healthy site than at the declining site during the growing season.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e6“chlorophyll concentrations in needles increased more at the healthy site than at the declining site during the growing season and with increasing needle age as predicted by a nutritional disharmony model”
Claim · model-written summary
Chlorophyll concentrations in needles increased with increasing needle age, as predicted by a nutritional disharmony model.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e6“chlorophyll concentrations in needles increased more at the healthy site than at the declining site during the growing season and with increasing needle age as predicted by a nutritional disharmony model”
Claim · model-written summary
Foliar chlorophyll and nutrient analyses of needles are proposed as a quick method to identify the soil processes causing forest decline.
Verbatim
e0“Increasing needle chlorosis at a declining Piceaabies (L.) Karst. site in northeast Bavaria, Germany”
e7“The use of foliar chlorophyll and nutrient analyses of needles representing a range in severity of chlorosis is proposed as a quick method of identifying the soil processes which, in some areas, cause forest decline”