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Climate-altered Precipitation is more Important than Land Use when Modeling Ecosystem Services Associated with Surficial Processes

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Abstract

Ecosystem services (ESs) associated with surficial processes may change according to shifts in land use, land cover, and climate parameters. Estimating these shifts can be important for land development planning, as urbanization alters soil processes that can manifest legacy effects. We employed the InVEST suite of models for sediment retention, nutrient delivery, and carbon storage to postulate how these ESs will change in the Upstate of South Carolina under future precipitation and land use and land cover (LULC) scenarios. We used the average precipitation from 1981–2010 and WorldClim precipitation projections for 2021–2040 and 2041–2060 to embody climatic precipitation shifts. For our LULC scenarios, we used 2011 and 2016 NLCD landscapes, then projected future LULC to hypothesize four future scenarios. We found that for the ES models that included both precipitation and LULC as inputs, precipitation dictated ES delivery far more heavily than land use or land cover. LULC scenarios produced consistent changes in ES delivery for all models except sediment export. Phosphorus and sediment exports increased between 2011 and 2016 due to LULC change, while nitrogen export stayed the same and carbon storage decreased. Land development that prioritizes forest cover will cause the least change in ESs, but allowing for continued forest loss to low-density development will have the most intense implications for ESs. Prioritization of land uses that preserve ESs associated with surficial processes will be critical to the longevity of agriculture and ecosystem integrity in this rapidly developing region. Land development planners should integrate consideration of ESs associated with surficial processes into future regional planning.

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Funding

Funding was provided by Furman University and USDA SSARE Grant LS21-359.

Author information

Authors and Affiliations

Authors

Contributions

CEV and JEQ conceived of and designed the research. CEV performed the scenarios and models. CEV and JEQ analyzed the data. CEV and JEQ wrote the paper.

Corresponding author

Correspondence to Caroline E. Vickery.

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Conflict of interest

The authors declare no competing interests.

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Appendices

Appendix 1 Default Parameters

The default values for model parameters for which regionally specific values were unavailable.

Model

Parameter

Default Value

NDR

Subsurface Critical Length (Nitrogen)

200

 

Subsurface Critical Length (Phosphorus)

200

 

Subsurface Maximum Retention Efficiency (Nitrogen)

0.8

 

Subsurface Maximum Retention Efficiency (Phosphorus)

0.8

SDR

Borselli IC0 Parameter

0.5

 

Max SDR Value

0.8

Both NDR and SDR

Borselli k Parameter

2

 

Threshold Flow Accumulation

1000

Appendix 2 Scenario Descriptions

  1. (1)

    Forest loss to low-density development: Using the InVEST Scenario Generator, 5% of forest cover area (deciduous, evergreen, or mixed) was converted to low-density development. Low-density development (i.e., subdivisions) has increased in recent years in the Upstate to accommodate the rapid population growth and is predicted to continue increasing (Terando et al. 2014). This scenario explores the effects of continued low-density development, which monopolizes greater land area but less intensely alters the landscape compared to high-density development (i.e., densely populated urban areas).

  2. (2)

    Forest loss to medium-density development: Similar to Scenario (1), the InVEST Scenario Generator produced this land use scenario by converting 2% of forest area to medium-density development. This scenario presents a politically regulated reality that intensifies LULC change in a smaller area to preserve greater tracts of naturalized land, specifically forest cover throughout the Upstate, while still accommodating future population growth.

  3. (3)

    Forest increase: The InVEST Scenario Generator converted non-forest and non-water pixels to equal areas of evergreen, deciduous, and mixed forest cover. Forest cover increased 5% from the 2016 forested area.

  4. (4)

    Restoration of steep cultivated lands: Agricultural lands with grades greater than 10% are considered “steep cultivated lands”, as soils with slopes steeper than 10% are unsuited for cultivation (State Tax Commission of Missouri 2008). Using GIS, we identified all agricultural lands, which were then overlaid with the slope calculated from the elevation data. Pixels that were either cropland or pasture with a slope greater than or equal to 10% were converted to mixed forest or grassland, respectively. This scenario theorizes how sediment and nutrient retention would change if degraded cultivated lands with slopes greater than 10% were restored to their original land cover. We hypothesized that the original land cover would have greater nutrient and sediment retention as well as C storage due to greater and more complex vegetated cover.

Appendix 3 – Contextual map of ecoregions, counties, and 2016 NLCD LULC for the study area

Appendix 4 Enumerated InVEST Outputs for the 44 models included in this study

Output Number

Model

ES

LULC Scenario

Precipitation Year

1

NDR

N Export

2011 Land Use

2016

2

NDR

N Export

2016 Land Use

2016

3

NDR

N Export

2016 Land Use

2021–2040

4

NDR

N Export

2016 Land Use

2041–2060

5

NDR

N Export

FL to LD Development

2016

6

NDR

N Export

FL to LD Development

2021–2040

7

NDR

N Export

FL to LD Development

2041–2060

8

NDR

N Export

FL to MD Development

2016

9

NDR

N Export

FL to MD Development

2021–2040

10

NDR

N Export

FL to MD Development

2041–2060

11

NDR

N Export

Forest Increase

2016

12

NDR

N Export

Forest Increase

2021–2040

13

NDR

N Export

Forest Increase

2041–2060

14

NDR

N Export

Recovery of Steep Agriculture

2016

15

NDR

N Export

Recovery of Steep Agriculture

2021–2040

16

NDR

N Export

Recovery of Steep Agriculture

2041–2060

17

NDR

P Export

2011 Land Use

2016

18

NDR

P Export

2016 Land Use

2016

19

NDR

P Export

2016 Land Use

2021–2040

20

NDR

P Export

2016 Land Use

2041–2060

21

NDR

P Export

FL to LD Development

2016

22

NDR

P Export

FL to LD Development

2021–2040

23

NDR

P Export

FL to LD Development

2041–2060

24

NDR

P Export

FL to MD Development

2016

25

NDR

P Export

FL to MD Development

2021–2040

26

NDR

P Export

FL to MD Development

2041–2060

27

NDR

P Export

Forest Increase

2016

28

NDR

P Export

Forest Increase

2021–2040

29

NDR

P Export

Forest Increase

2041–2060

30

NDR

P Export

Recovery of Steep Agriculture

2016

31

NDR

P Export

Recovery of Steep Agriculture

2021–2040

32

NDR

P Export

Recovery of Steep Agriculture

2041–2060

33

CS

C Storage

2011 Land Use

n/a

34

CS

C Storage

2016 Land Use

n/a

35

CS

C Storage

FL to LD Development

n/a

36

CS

C Storage

FL to MD Development

n/a

37

CS

C Storage

Forest Increase

n/a

38

CS

C Storage

Recovery of Steep Agriculture

n/a

39

SDR

Sediment Export

2011 Land Use

n/a

40

SDR

Sediment Export

2016 Land Use

n/a

41

SDR

Sediment Export

FL to LD Development

n/a

42

SDR

Sediment Export

FL to MD Development

n/a

43

SDR

Sediment Export

Forest Increase

n/a

44

SDR

Sediment Export

Recovery of Steep Agriculture

n/a

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Vickery, C.E., Quinn, J.E. Climate-altered Precipitation is more Important than Land Use when Modeling Ecosystem Services Associated with Surficial Processes. Environmental Management 72, 1216–1227 (2023). https://doi.org/10.1007/s00267-023-01861-6

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